Multiple Device : Crash in world soon after loading with 1.20 features enabled or without

Summary:
Crash kept on happening in world when enabling 1.20 features/without it.

Steps to Reproduce:
Step 1)Create a new world in lastest beta.
Step 2)Enable the 1.5 sneak toggle,experiment toggle and education edition (optional) /without enabling it.
Step 3)Play the world.

Observed Results:
Crash happen in world when enabling the affected toggle above.

Expected Results:
Crash should not happen in world when enabling the affected toggle above.

Notes:
(This also happen even when you remove or disable the addons/mods or packs in the games and also delete and then reinstalling the game back.)The crash happen about a few minutes like 5-20 mins.