When trying to enter two block high doorways one block above you, it is possible to just walk through when standing on blocks that suspend you 0.5 blocks up (half slabs) but not on blocks that suspend you by 0.8 (End Portal frames and Soul Sand).
I listed this glitch under version 1.4.7, however i feel it is noteworthy that this bug has in fact been in the game for a long time.
MC-8462
Glitchy height issues with certain blocks.
Resolved
Duplicate
0
Duplicate of MC-3337, please use the search function to see if your bug has already been submitted. Currently over 50% of tickets are being closed as duplicate.