Icons are invisible

[fm-sys]

After upgrading to Nextcloud 21, many icons are invisible. This issue might happen also for other Nextcloud Apps, but I have noticed it only on deck until now...

[Jonas-itquirks]

I have a very similar problem, which exists on my local install but not on the nextcloud instant trial (https://try.nextcloud.com/).
The details button is there but invisible.

Nextcloud 21.0.1
Deck 1.4.0

PS: This Button btw did work in version 1.3.2 to call up board details.

[juliusknorr]

Fix for the second report is in nextcloud/viewer#856 the other one I cannot really repoduce, could you check if that might be a browser caching issue?

[fm-sys]

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