For some reason my collision blocking is not working the way it used to and I can't figure out why

There is a lot of stuff that I looked at, but is there anything that I might have missed or not remembered?

I don’t know anything about your setup, but often with pawns / physics etc, blocking won’t work unless the collision volume is the root component. ( wild shot in the dark ).

You must provide more information about what/how you are doing. You’re question is too generic.