In a Deck card, posting a comment with a @mention fails

[maximelehericy]

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Describe the bug
It is not possible to post a comment in a Deck card when the comment contains a @mention

To Reproduce
Steps to reproduce the behavior:

1. Go to the comments section of a deck card
2. Type "Coucou " and mention somebody
3. Hit enter
4. Nothing happens
5. Remove the @mention
6. Hit enter
7. The comment is posted

Expected behavior
Coucou @somebody should be posted

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

Client details:

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]
• Device: [e.g. iPhone6, desktop]

Server details

Operating system:

Web server:

Database:

PHP version:

Nextcloud version: (see Nextcloud admin page) c.nc.c (32)

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) ...