The collision shape of the border is determined by flooring the min values and ceiling the max values, so the isCollidingWithBorder() function should mirror such behavior.
The epsilon used was in the opposite direction, which would cause
the getCollisions method to incorrectly return it for when players
were exactly on the border but not colliding. To bring it in-line
with the rest of the collision code, the collision must be into
the border by +EPSILON.
Fixes https://github.com/PaperMC/Paper/issues/9859
The correct logic to implement NOT_SAME with Shapes#block()
is to test whether any shape data exists outside of [0.0, 1.0]
and to test whether the shape is completely filled from 0.0 to 1.0
on all axis. This can be implemented by checking whether the
bounds represent the full block and whether everything within
the bounds is filled.
