Unknown Block Breaking Interaction

A specific block at a corner of 0, 0, 0 (-1, 0, -1 is that specific block) breaks randomly for no reason. it only occurs in Gamemode 0 (Survival). This seems to be an unknown player interaction since it doesn't break said block if the block being broken has a deny block under it. I don't know why this occurs and it confuses me. Sometimes it can cancel out if you do it right, but overall I've been experiencing this issue and I don't know why. This affects other worlds too.