Sometimes the nether has overworld mobs like spiders, zombies, and creepers which destroys the portal from the nether's side. Other times, my friend(s) or I come back from the nether from XP farming (blaze rod spawners). This always seems to happen ONLY when we come back from the nether.
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Thank you for your report!
We're tracking this issue under MCPE-63268 so I've requested this report be resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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