The bug is sort of fixed. The axolotls do not go up and down like in the video, but are still moving weirdly due to the high tickspeed, like any other mob. So i'd say this bug is fixed, while the tickspeed bug is still there.
I will check when i have time
I forgot to add that this bug only occurs when the randomtickspeed is set very high. I don't know if it still occurs though.
The bug is sort of fixed. The axolotls do not go up and down like in the video, but are still moving weirdly due to the high tickspeed, like any other mob. So i'd say this bug is fixed, while the tickspeed bug is still there.