Mobs can hit player from 1-2 blocks away.

So from what's been happening, every time a mob is by me, they like get me from like a block away. I don't know if that's really a bug but I've never experienced getting attacked from a block or 2 away before. And its kind of annoying. I don't know if it has something to do with it being the preview version. If it can be fixed, please fix it. Thank You!