On Minecraft bedrock realms, there is a chance of random chunks being unloaded from the world. Leaving and joining back does not fix the error and everyone on the realm sees the missing chunk. If a player logs out near the unloaded chunks they cant rejoin the realm. The only known short-term solution is to close the realm and reopen it.
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I have the same issue. which started when trying to link nether portals which failed

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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