I was playing the recent Sonic the Hedgehog Mash-Up Pack, and when the Auto Save Icon appears, the game freezes for a solid minute or just crashes outright. There is also a problem with level chunks or light sources refusing to spawn. This hasn't been a problem on any other platform I've played Minecraft Bedrock on. Only on the Switch.
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Thank you for your report!
We're tracking this issue in MCPE-40976, so this ticket is being resolved and linked as a duplicate.
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It might be because of the Pack. Try turning off the pack and see if the problems go away.