If Minecraft login Xbox account offline , the screen of the world will freeze when I save the world or it save automatically (but it still save successfully) . I test this problem on iPhone 8 and iPhone 7+.

How to find this issue on your device:
(1) Login xbox account in Minecraft when your device is online.
(2) Turn any Network then Re-open Minecraft ,and let it login automatically.
(3) Open the world , play for about 1 ~ 2 minutes or press pause and save the world.
(4) IT FREEZE!!! But if you Re-open Minecraft again ,you will see the wold is saved (sometimes not).