I've noticed when choosing my world from the list by touching the screen sometimes kills me when loaded in. It doesn't happen ALL the time but I managed to get in on camera. Also, it sometimes kills me in an area close to my original spawn point. NOT the area of where I last left the game in.
Here's the unlisted video: https://youtu.be/USiL09dpN18
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duplicates
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Thank you for your report!
We're actually already tracking this issue at MCPE-38374, so we will resolve and link this ticket as a duplicate.
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Seems to only happen when in a body of water.