Card creation with Smart Picker does not save tags and descriptions, start date cannot be set through Smart Picker

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Describe the bug
When creating cards through the Smart Picker (e.g. in Collectives), selected tags and the entered description does not get saved.

Additionally, it is not possible to enter a start date which is now possible in Deck.

To Reproduce
Steps to reproduce the behavior:

1. Open the "Create Deck card" Smart Picker option in Collectives
2. Create a card with title, tags, duedate and description
3. The card widget in collectives will not show the tags and description
4. The card in deck will not show tags and description

Expected behavior
Everything gets saved

Screenshots

Client details:

• OS: Linux Mint, Android
• Browser: Firefox, Zen (based on Firefox)
• Version [e.g. 22]
• Device: [e.g. iPhone6, desktop]

Login as admin user into your Nextcloud and access
http://example.com/index.php/settings/integrity/failed
paste the results here.

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your Nextcloud installation folder

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your Nextcloud installation folder

or

Insert your config.php content here
Make sure to remove all sensitive content such as passwords. (e.g. database password, passwordsalt, secret, smtp password, …)

Insert your Nextcloud log here

Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log
c) ...

Start by reproducing the Create Deck card Smart Picker option in Collectives with tags, a description, a due date, and a start date. Inspect the card-creation request and the resulting card in Deck to determine which fields are missing. Done means tags and descriptions persist and a start date can be set through Smart Picker.