Edit : cats and dogs TP into transparent/solid blocks and as a result of recent changes (to prevent x-ray machines), suffocates. We first though it was only in leaves, but in fact they can tp in every transparent solid block. The only way to solve this is to allow cats/dogs to top only in transparent non solid blocks

Initial post : Cats get TP into leaves, suffocate and die. That's related to the fact that leaves are now making you suffocate.
That's a real nightmare because it's impossible to get a cat now, as you have to be in a jungle (which have a lot of leaves). When you try to go out of the jungle, cats either get stucked in leaves or tp INTO leaves, and die.

This also happens with blocks with inclined rails.

Ps : This not related to MC-2025 as MC-2025 concerns chunks loading. This issue on the contrary happen when your are ingame, with all the chunks loaded around.