Unable to access a collection: Unexpected end of JSON input

Hello, we are currently maintaining a site using Gatsby.js and Netlify CMS. Last week the CMS started failing to load a collection(file collection) of pages returning the error: `Unexpected end of JSON input`. We are getting the error on mediaLibrary.js and entrie.js resulting in the CMs not loading that collection. This issue only happens when we run the project locally, on production the CMS is working as expected.

**Describe the bug**
1. we have a site with a collection named pages
2. we have a site with over 1000 images
3. we are using bitbucket as the backend
4. mediaLibrary.js and entries.js fails with the Unexpected end of JSON input error, hence those collections are inaccessible

**Applicable Versions:**

- Netlify CMS version: 2.14.3
- Git provider: Bitbucket
- OS: Mac OS Catalina

- Node.JS version: 12+

**CMS configuration**
```javascript
init({
config: {
slug: {
clean_accents: true,
},
backend: {
name: 'bitbucket',
repo: [our-repo-name],
branch,
cmsLabelPrefix: branch,
auth_type: 'implicit',
app_id: process.env.NETLIFY_APP_ID,
},
media_folder: 'static/uploads',
public_folder: '/uploads',
publish_mode: 'editorial_workflow',
local_backend: env === 'local',
collections: CMS_COLLECTIONS,
},
});
```

I appreciate it if you guys could help us figure out this error, we have been trying to debug it ourselves but we haven't found what is causing those errors to throw. If you need more information I'll happily add it.

Regards