The header of the card being edited is not visible

Nextcloud 19 - problem with Deck
You cannot see the title of the event being edited or when it was last modified. Checked on various browsers on both Windows and MacOS

There is an issue:

The description shows that the App.vue file which is used to build Nextcloud has changed. Is it possible to change the files of an already working system ??

See this answer for a temporary workaround until the issue has been fixed upstream.