So I was playing Realms when the Nether Update just dropped into bedrock, then when I tried to go to my pause menu to save & exit the game this thing popped up. I told my friend about the problem and they didn't know what the problem was. So I Alt+F4'd out of Minecraft and went on Singleplayer to check if the problem was in realms or not, turns out it was also effecting Singleplayer. I do not know if this effects other players too or not. But it certainly annoys me. I've been waiting for quite a while and it's still in this screen.
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Thank you for your report!
We're actually already tracking this issue at MCPE-78040, so I will resolve and link this ticket as a duplicate.
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FIX
I know what is causing this. If you use a resource pack from 1.15 it causes this to happen. Once you stop using it the problem stops. Using outdated resource packs causes problems like these.