After opening link in Collabora, filemager shows white space

Hello all together,
I am experiencing the following issue in the current 21.1 Version.

I go to the filemanager tab and select some folder to view the items:

image.png1255x618 47.1 KB

Then I go to another application tab, i.e. Calendar and click on a linked spreadsheet to open it in in collabora.

image.png721x461 18.7 KB

The file opens, but when I return to the filemanager tab the selected path shows only a white space:

image.png1034x866 7.71 KB

Can anybody confirm this?

Thank you all and best regards,

Alex