Yes, and both have been fixed in this regard (or will be in the next patch!)
Trivia: they're both based on the small Mimic, which didn't have to deal with walls
I was playing some 2P arcade a few days ago and everything seemed to be moving a little bit faster than I was used to, which I chalked up to latency issues or something. I assumed it was also latency issues when I got to Pumpkin Woods, where I kept smacking pumpkins with my wand or popping them with arrows, but they absolutely would not take the on-hit-stun pause. Did this behavior get changed in the update as well?
Edit - I just toggled beastmode on and went there in storymode. Yeah, they have a MUCH shorter 'pause' duration. If you're not constantly damaging them you're going to get chewed up by them.