Bug: Rich workspace links to Collabora Online / OnlyOffice files don't work

Linking to a Collabora Online or OnlyOffice file in Rich workspace doesn’t work, generating a pop-up error message “There is no plug-in available to display this file type”.

My setup:
Nextcloud version : 21.0.2
PHP version : 7.4
Collabora Online: 4.0.4 / OnlyOffice 7.0.2

Steps to replicate it:

  1. Create a link to a Collabora Online / OnlyOffice file in the Rich workspace section
  2. Click on the link


Rich Workspace error when linking to a Collabora Online file - NC 21.0.1

This bug seems related to Nextcloud, not CollaboraOnline nor Onlyffice: is it planned to be fixed in NC 21.0.4 / 22.1.0 ?