You must log out of your current Gamertag and log into your new one.
This also happens on Realms. We built a thousand blocks out to find end cities and the Dragon despawned.
No I didn't see the ghast but I heard the sounds from it. The difficulty was on peaceful and whenever I switched back to hard the other nether mobs were spawning like usual.
I get this to. I usually have to play for around 10 minutes for it to go away.
The same is happening to me. I have a LG phone and it is not going passed the white screen.
LG Aristo 2
This also affects whenever you are suffocating in blocks.