Updated description by @unknown
Steps to reproduce
Place a cactus block.
Walk away >> 15 blocks.
Summon a cat, tame it, and make it stand it up.
Teleport the cat onto the top of the cactus.
Expected result
The cat teleports back to you because it is a pet, is > 12 blocks away, and is not sitting.
Actual result
The cat stays on top of the cactus until it dies.
Original description
If a animal in Minecraft teleports onto a cactus while teleporting to you it will remain on the cactus, and if the cactus is not broken it will sit there and die. I have only experienced this glitch with cats and only on bedrock edition for Xbox One.
Linked issues
testing discovered
Comments

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Still an issue.
Confirmed for cats only, as regards teleporting.
Pet wolves/dogs will teleport off of cactus.
Walking off of cactus is a problem for a much larger set of mobs, so I have made MCPE-101670 for that.