ZDaemon

[Keyboard_Doomer]

Linedefs can't be crossed if the sector they're attached to has a difference between the ceiling height and the floor height that is over 32,767.
Instead, such linedefs will block the players trying to cross them. The line action can still be activated at the vertexes if the neighboring sector has a lower height difference but that section might not be accessible (such as with the teleporter on the left surrounded by a short wall in the first test map).

Note that I'm using only teleporters in the test maps but from my tests the behavior seems to be the same regardles of the line action used.

Test maps:
height_difference_32768.wad
height_difference_32767.wad (everything OK in this one, provided just for comparison)

[Krawa]

Moved to Confirmed Bugs.

[Krawa]

Will be fixed in 1.11.