I have found out, that if I add an block, which actually works, I can also see the block section to administrate. Once I delete this block again, I again run into 502 error.
What exactly do you need in terms of the environment data?
PHP version: 7.4.29
running on a quite sufficient vserver.
So I added another block which I just did not activate, hence I can access the block administration again, but of course this is not the intended state
Thanks in advance and Kind Regards