Vertically maximize a non-vertically-maximized window. Then try to snap it, either to a quarter or to a half of the screen. Instead of tiling it, it brings it to its original size, i.e. the size it had before being vertically maximized.
I should add that this problem does not occur when tiling to the whole screen (i.e. maximizing).
Most likely same regression as bug #376155 *** This bug has been marked as a duplicate of bug 376155 ***
*** This bug has been marked as a duplicate of bug 376104 ***