On one of my worlds I have all the experimental features turned on. This has caused me many issues since 1.17 came out. The bug at the moment with the worl is that when I load this world up, after about 30seconds it crashes my game. It has done this every time I have tried to go on this world, I have made copies of the world, restarted my game and xbox to try and resolve this issue but it hasn't worked.
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Thank you for your report!
We're tracking this issue in MCPE-143269, so this ticket is being resolved and linked as a duplicate.
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Same here. Logged under MCPE-144019. Please go and vote for this issue as it will gain more attention if we all vote on the same issue without duplicates.