If you use a glaive for example i can hit mobs behind walls. Doesnt seem very intendet.

Can you describe more how you are hitting the mobs behind walls? Is it through a non-standard block that has openings in it, like a fence block?

Its a solid block like planks or cobblestone. Another player stood behind the blocks and i could easily hit through it when he pressed himself against it.

our current implementation of attack reach should be working just fine now, feel free to reopen this issue if it persists.