ca-certificates (from 20200601~deb10u1 to 20200601~deb10u2)
tzdata (from 2020e-0+deb10u1 to 2021a-0+deb10u1)
With a good clean Nextcloud working, after doing the above update I found that the Nextcloud App store is broken…
All of your installed apps are ok but you cannot install any more. The list of app groups is no longer visible on the left. If you remove an app you will not be able to get it back.
I tested this three times recovering from a backup each time.
No it’s an issue with the Nextcloud app store itself : https://apps.nextcloud.com was down.
I can access apps perfectly again now, is it the same for you ?