Oh, I hadn’t thought of that, but yes, of course Nextcloud doesn’t like it when you change any core files. Well, in that case, I guess we only get to choose whether we want to go with a red or yellow message in the overview until an official update with the fix is released 
In case anyone that already applied the patch wants to revert it…
Download the patch again…
Nextcloud 28.0.9:
wget https://github.com/nextcloud/server/pull/47377.patch
Nextcloud 29.0.5:
wget https://github.com/nextcloud/server/pull/47378.patch
…and then revert it with the following command:
Nextcloud 28.0.9:
patch -R -p 1 < 47377.patch
Nextcloud 29.0.5:
patch -R -p 1 < 47378.patch
Don’t forget to delete the .patch file if you downloaded it into the nextcloud folder, or you’ll get an integrity check warning because of the extra file