[Sarah54321]

We can't move diagonally through tiles that are occupied by either side.

Uh, as in, if say you're surrounded by four things, if you try to move diagonally to get out, you cannot, even if the space you are trying to move to is free.

[Neus]

This isn't a bug. It's part of how pixel movement works, because your character is represented by a collision box.