For more information, this seems to be the same bug as
Happy Ghast reduce tps when it is leashed either by player or to fence when it touch the ground.
Sorry it’s been a while. This bug should to be marked as resolved by now. The bug really disappeared as DLon King mentioned.
The world file is too big too upload here (160 MB zip). So, I attach a google drive link to the file instead. Link here
Now for the questions
I created the world on May 31st this year. It was in survival and no cheat. The difficulty was not peaceful, maybe normal or easy. Then, after a day I turned on cheat to enable keep inventory. After that until now I changed difficulty and game mode so many time I cannot remember. (I changed to keep inventory in setting, not by command)
I have not. I will try and see if this happen again. *update: I tried and it happen again today.
I must tell one thing and answer and a question
It does still happen occasionally in the world I have been playing. Even to my friend when I assassinate him today.
I create a new realm world and having been playing for more than 1 hour. I deliberately try to die as many time as I can with keep inventory. But the bug have not happen again. So, I am either lucky or the new world will never trigger the bug.
Yeah, it happens when bottom of the leashed Happy Ghast (either by fence or player) touch the ground.