Checklist disappears when switching view then checking checkbox

[Nyco]

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Describe the bug
Checklists and description (text content) of a card simply disappears when I try to toggle view and then check a checkbox in checklist

To Reproduce (not completely sure yet)
Steps to reproduce the behavior:

1. Create card
2. Edit description adding some - [ ] blah blah lines
3. Close editor
4. Switch view: modal to sidebar or sidebar to modal
5. Check one checkbox
   => The text content disappears

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
If applicable, add screenshots to help explain your problem.

1. Create card, edit checklist, in sidebar
   
2. Save checklist (close editing)
   
3. Switch to modal view
   
4. Check on "zwei" entry, description content disappears
   

Client details:

• OS: [e.g. iOS] Ubuntu 20.04 LTS
• Browser [e.g. chrome, safari] Chrome latest Version 86.0.4240.198 (Build officiel) (64 bits)
• Version [e.g. 22]
• Device: [e.g. iPhone6, desktop] Laptop Lenovo X1 Carbon

Server details

Operating system:

Web server:

Database:

PHP version:

Nextcloud version: (see Nextcloud admin page) 19.0.4, Deck 1.2.0

Where did you install Nextcloud from:

Signing status:

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

List of activated apps:

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

Nextcloud configuration:

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, …)

Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/...

Logs

Nextcloud log (data/nextcloud.log)

Insert your Nextcloud log here

Browser log

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

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

[reox]

duplicate of #2351?

[stefan-niedermann]

Yep, let's track it down in #2351 and close this.

[ajeoc]

I have the same issue like Nyco and it is according to the description in #2351 and #2061 not a duplicate.
When i have a card with markdown like:

• 1
• 2
• 3
  and i close and reopen the card details. i check one box and all is gone.

[juliusknorr]

Duplicate of #2580, fixed with #2584