I just clicked on my world and the screen went black and the game crashed, now its gone, last backup 6 weeks ago. I'm afraid I can't give you any more info
Update: Removing Microsoft Account and re-adding it means the world is now there, but corrupted/not fully synced
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Fixed in 1.16.100.57 according to changelogs

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We're tracking this issue in MCPE-62153, so this ticket is being resolved and linked as a duplicate.
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This happened to me can’t even go 5 minutes on the game all my houses and cats/ wolfs have disappeared and they where hard to tame since I can’t go more then 5 minutes