Can't check which list a particular block comes from

[TatharNuar]

I can't look up what list a blocked user is on because the actions page gives a 504 error and times out when trying to load it, and no other page has this feature. I am subscribed to multiple large block lists (my blocks count suggests that less than half of the blocks are propagating, despite plenty of time for them to do so) and I need to know whether an unexpected block came from one of them.