I've tested with other transparent blocks as well. If there's anything with a hitbox above them, they won't open. This includes ladders, but doesn't include torches because torches don't have a hitbox. I think this works as intended, but it's always better to check.
I've tested with other transparent blocks as well. If there's anything with a hitbox above them, they won't open. This includes ladders, but doesn't include torches because torches don't have a hitbox. I think this works as intended, but it's always better to check.