Can't read created entries in the cms, altough will push them to git after a minute of 404 errors in console.

**Describe the bug**
First of all this is in production. If have set up pkce authorization and got it working correctly with a GitLab instance.
I have created a collection, of which there were already some files not created through CMS that follow the fields in config. These files show up.

When creating a new entry, it loads for about one minute, during which, it throws tens of 404 errors in console related to the gitlab api. As I was writing this, it actually worked (still errors in console though), however my friend also made entry which didnt work. What happened for him was that after loading, it looked like this:
`screenshot 1`

While inside the collection, the console looks like this after a page load
`screenshot 2`

Currently, an entry I made about 25 minutes ago, neither me or my friend can see in the CMS, an entry he did 10 minutes ago we both can see, one he did 5 minutes ago neither can see. All of them have been pushed to git

Some more info. Don't know if it's I'm being excessive a this point. Apparently, if we try creating an entry with an image in netlify-CMS it works, but if we upload an image when creating it, it doesn't work. The images uploaded in tandom with the malfunctioning entries, doesn't get added to the CMS either, although they get pushed to git.

**To Reproduce**
Go to my collection ("medlemmar")
See error (on every page load).

Or:
Create entry
upload an image, when selecting on the image field.
See error.

Edit: Sry for shitty steps here, but I wasn't really sure what to write. I mean no one else can push to our repo, so I don't think anyone could reproduce it.

**Expected behavior**
For the entries and images to show up in netlify CMS for all users.

**Screenshots**
screenshot 1: 
screenshot 2: 

**Applicable Versions:**

- Netlify CMS version: netlify-cms 2.10.192
- Git provider: Gitlab self-hosted
- OS: Windows 10
- Browser version Vivaldi 5.6.2867.40
- Node.JS version: 19.2.0

**CMS configuration**
*My collection is at the bottom, the rest is pasted from docs examples*
```yaml
backend:
name: gitlab
repo: Kodvet/sektionshemsidan auth_type: pkce
app_id: I'm guessing I should hide this
api_root: https://gitlab.liu.se/api/v4
base_url: https://gitlab.liu.se/
auth_endpoint: oauth/authorize
branch: main

local_backend: false

media_folder: "static/images"
public_folder: "/images"

collections: # A list of collections the CMS should be able to edit

- name: 'posts' # Used in routes, ie.: /admin/collections/:slug/edit
label: 'Posts' # Used in the UI
label_singular: 'Post' # Used in the UI, ie: "New Post"
description: >
The description is a great place for tone setting, high level information, and editing
guidelines that are specific to a collection.
folder: '_posts'
slug: '{{year}}-{{month}}-{{day}}-{{slug}}'
summary: '{{title}} -- {{year}}/{{month}}/{{day}}'
create: true # Allow users to create new documents in this collection
view_filters:
- label: Posts With Index
field: title
pattern: 'This is post #'
- label: Posts Without Index
field: title
pattern: front matter post
- label: Drafts
field: draft
pattern: true
view_groups:
- label: Year
field: date
pattern: \d{4}
- label: Drafts
field: draft
fields: # The fields each document in this collection have
- { label: 'Title', name: 'title', widget: 'string', tagname: 'h1' }
- { label: 'Draft', name: 'draft', widget: 'boolean', default: false }
- {
label: 'Publish Date',
name: 'date',
widget: 'datetime',
date_format: 'YYYY-MM-DD',
time_format: 'HH:mm',
format: 'YYYY-MM-DD HH:mm',
}
- label: 'Cover Image'
name: 'image'
widget: 'image'
required: false
tagname: ''

- { label: 'Body', name: 'body', widget: 'markdown', hint: 'Main content goes here.' }

- name: 'faq' # Used in routes, ie.: /admin/collections/:slug/edit
label: 'FAQ' # Used in the UI
folder: '_faqs'
create: true # Allow users to create new documents in this collection
fields: # The fields each document in this collection have
- { label: 'Question', name: 'title', widget: 'string', tagname: 'h1' }
- { label: 'Answer', name: 'body', widget: 'markdown' }

- name: 'settings'
label: 'Settings'
delete: false # Prevent users from deleting documents in this collection
editor:
preview: false
files:
- name: 'general'
label: 'Site Settings'
file: '_data/settings.json'
description: 'General Site Settings'
fields:
- { label: 'Global title', name: 'site_title', widget: 'string' }
- label: 'Post Settings'
name: posts
widget: 'object'
fields:
- {
label: 'Number of posts on frontpage',
name: front_limit,
widget: number,
min: 1,
max: 10,
}
- { label: 'Default Author', name: author, widget: string }
- {
label: 'Default Thumbnail',
name: thumb,
widget: image,
class: 'thumb',
required: false,
}

- name: 'authors'
label: 'Authors'
file: '_data/authors.yml'
description: 'Author descriptions'
fields:
- name: authors
label: Authors
label_singular: 'Author'
widget: list
fields:
- { label: 'Name', name: 'name', widget: 'string', hint: 'First and Last' }
- { label: 'Description', name: 'description', widget: 'markdown' }

- name: 'kitchenSink' # all the things in one entry, for documentation and quick testing
label: 'Kitchen Sink'
folder: '_sink'
create: true
fields:
- label: 'Related Post'
name: 'post'
widget: 'relationKitchenSinkPost'
collection: 'posts'
display_fields: ['title', 'date']
search_fields: ['title', 'body']
value_field: 'title'
- { label: 'Title', name: 'title', widget: 'string' }
- { label: 'Boolean', name: 'boolean', widget: 'boolean', default: true }
- { label: 'Map', name: 'map', widget: 'map' }
- { label: 'Text', name: 'text', widget: 'text', hint: 'Plain text, not markdown' }
- { label: 'Number', name: 'number', widget: 'number', hint: 'To infinity and beyond!' }
- { label: 'Markdown', name: 'markdown', widget: 'markdown' }
- { label: 'Datetime', name: 'datetime', widget: 'datetime' }
- { label: 'Date', name: 'date', widget: 'date' }
- { label: 'Color', name: 'color', widget: 'color' }
- {
label: 'Color string editable and alpha enabled',
name: 'colorEditable',
widget: 'color',
enableAlpha: true,
allowInput: true,
}
- { label: 'Image', name: 'image', widget: 'image' }
- { label: 'File', name: 'file', widget: 'file' }
- { label: 'Select', name: 'select', widget: 'select', options: ['a', 'b', 'c'] }
- {
label: 'Select multiple',
name: 'select_multiple',
widget: 'select',
options: ['a', 'b', 'c'],
multiple: true,
}
- {
label: 'Select numeric',
name: 'select_numeric',
widget: 'select',
options:
[{ label: 'One', value: 1 }, { label: 'Two', value: 2 }, { label: 'Three', value: 3 }],
}
- { label: 'Hidden', name: 'hidden', widget: 'hidden', default: 'hidden' }
- label: 'Object'
name: 'object'
widget: 'object'
collapsed: true
fields:
- label: 'Related Post'
name: 'post'
widget: 'relationKitchenSinkPost'
collection: 'posts'
search_fields: ['title', 'body']
value_field: 'title'
- { label: 'String', name: 'string', widget: 'string' }
- { label: 'Boolean', name: 'boolean', widget: 'boolean', default: false }
- { label: 'Text', name: 'text', widget: 'text' }
- { label: 'Number', name: 'number', widget: 'number' }
- { label: 'Markdown', name: 'markdown', widget: 'markdown' }
- { label: 'Datetime', name: 'datetime', widget: 'datetime' }
- { label: 'Date', name: 'date', widget: 'date' }
- { label: 'Image', name: 'image', widget: 'image' }
- { label: 'File', name: 'file', widget: 'file' }
- { label: 'Select', name: 'select', widget: 'select', options: ['a', 'b', 'c'] }
- label: 'List'
name: 'list'
widget: 'list'
fields:
- { label: 'String', name: 'string', widget: 'string' }
- { label: 'Boolean', name: 'boolean', widget: 'boolean' }
- { label: 'Text', name: 'text', widget: 'text' }
- { label: 'Number', name: 'number', widget: 'number' }
- { label: 'Markdown', name: 'markdown', widget: 'markdown' }
- { label: 'Datetime', name: 'datetime', widget: 'datetime' }
- { label: 'Date', name: 'date', widget: 'date' }
- { label: 'Image', name: 'image', widget: 'image' }
- { label: 'File', name: 'file', widget: 'file' }
- { label: 'Select', name: 'select', widget: 'select', options: ['a', 'b', 'c'] }
- label: 'Object'
name: 'object'
widget: 'object'
fields:
- { label: 'String', name: 'string', widget: 'string' }
- { label: 'Boolean', name: 'boolean', widget: 'boolean' }
- { label: 'Text', name: 'text', widget: 'text' }
- { label: 'Number', name: 'number', widget: 'number' }
- { label: 'Markdown', name: 'markdown', widget: 'markdown' }
- { label: 'Datetime', name: 'datetime', widget: 'datetime' }
- { label: 'Date', name: 'date', widget: 'date' }
- { label: 'Image', name: 'image', widget: 'image' }
- { label: 'File', name: 'file', widget: 'file' }
- { label: 'Select', name: 'select', widget: 'select', options: ['a', 'b', 'c'] }
- label: 'List'
name: 'list'
widget: 'list'
fields:
- label: 'Related Post'
name: 'post'
widget: 'relationKitchenSinkPost'
collection: 'posts'
search_fields: ['title', 'body']
value_field: 'title'
- { label: 'String', name: 'string', widget: 'string' }
- { label: 'Boolean', name: 'boolean', widget: 'boolean' }
- { label: 'Text', name: 'text', widget: 'text' }
- { label: 'Number', name: 'number', widget: 'number' }
- { label: 'Markdown', name: 'markdown', widget: 'markdown' }
- { label: 'Datetime', name: 'datetime', widget: 'datetime' }
- { label: 'Date', name: 'date', widget: 'date' }
- { label: 'Image', name: 'image', widget: 'image' }
- { label: 'File', name: 'file', widget: 'file' }
- { label: 'Select', name: 'select', widget: 'select', options: ['a', 'b', 'c'] }
- { label: 'Hidden', name: 'hidden', widget: 'hidden', default: 'hidden' }
- label: 'Object'
name: 'object'
widget: 'object'
fields:
- { label: 'String', name: 'string', widget: 'string' }
- { label: 'Boolean', name: 'boolean', widget: 'boolean' }
- { label: 'Text', name: 'text', widget: 'text' }
- { label: 'Number', name: 'number', widget: 'number' }
- { label: 'Markdown', name: 'markdown', widget: 'markdown' }
- { label: 'Datetime', name: 'datetime', widget: 'datetime' }
- { label: 'Date', name: 'date', widget: 'date' }
- { label: 'Image', name: 'image', widget: 'image' }
- { label: 'File', name: 'file', widget: 'file' }
- {
label: 'Select',
name: 'select',
widget: 'select',
options: ['a', 'b', 'c'],
}
- label: 'Typed List'
name: 'typed_list'
widget: 'list'
types:
- label: 'Type 1 Object'
name: 'type_1_object'
widget: 'object'
fields:
- { label: 'String', name: 'string', widget: 'string' }
- { label: 'Boolean', name: 'boolean', widget: 'boolean' }
- { label: 'Text', name: 'text', widget: 'text' }
- label: 'Type 2 Object'
name: 'type_2_object'
widget: 'object'
fields:
- { label: 'Number', name: 'number', widget: 'number' }
- { label: 'Select', name: 'select', widget: 'select', options: ['a', 'b', 'c'] }
- { label: 'Datetime', name: 'datetime', widget: 'datetime' }
- { label: 'Markdown', name: 'markdown', widget: 'markdown' }
- label: 'Type 3 Object'
name: 'type_3_object'
widget: 'object'
fields:
- { label: 'Date', name: 'date', widget: 'date' }
- { label: 'Image', name: 'image', widget: 'image' }
- { label: 'File', name: 'file', widget: 'file' }
- name: 'medlemmar'
label: 'Medlemmar'
label_singular: 'Medlem'
folder: 'src/pages/sektionen/styrelsemedlemmar'
create: true
fields:
- { label: 'Namn', name: 'namn', widget: 'string'}
- { label: 'Post', name: 'post', widget: 'string'}
- { label: 'Kogvet mail', name: 'kontakt', widget: 'string'}
- { label: 'Bild', name: 'bild', widget: 'image'}
```

Edit:
Forgot to add
I'm seeing stuff about CORS in the errors. Googling lead me to adding a "_header" file right above index.html where the CMS is. With this inside:
```
/*
Access-Control-Allow-Origin: *
```
Didn't help