If you tame a cat in water it enters a state where it is "sitting" but it looks standing and it's bobbing in water but it won't teleport to the player.
If you tame a cat in water it enters a state where it is "sitting" but it looks standing and it's bobbing in water but it won't teleport to the player.
Please provide some videos or screenshots of this issue occurring whilst the F3 debug screen is enabled.