PLEASE DO NOTE THAT THIS CONCERNS THE BETA UNROFFICIAL RELEASES AND I'M TYPING IT HERE BECAUSE I CAN'T FIND IT IN THE SEARCH BAR OF "AFFECTS VERSIONS" I noticed this issue while playing on the Minecraft Pocket Edition v1.13.0.9 beta and beta v1.13.0.15. Whenever I run or walk when there's a 2-block high wall of any block type, my player immediately starts jumping as if he can reach the top of the second block. I'm used to playing with auto-jump on but when I turn that off, my player still jumps. Hope you can fiz this bug OR issue in the next beta unofficial releases on Minecraft Pocket Edition