Thanks for the report!
I'm the developer.
If you don’t mind, could you let me know what kind of situation the bug occurred in?
It would really help with reproducing the issue.
Hello! I was trying a bug that when you place a bomb and die, open the menu before the screen goes completely black, you will go back to the start point. And the place where you place the bomb will be appear a invisible hitbox. The bug happens when I make more than 10 of them(the hitboxes) and place a bomb at a cube which recovered. I've had the same bug on several of my attempts, so I'm sure that the bug is reproducible. (I'm sorry I can't speak English well. 日本語で言うほうがいいんですか?)