I'm playing in a survival world in 1.17, and when i make my nether portal to get to the nether everything is fine. But when i step through the portal, all i see on the other side is a void. I exited and then re-entered the world which fixed the nether, but when I went through the portal again toΒ get back to the overworld, the chunks wouldn't load and i could fall off into the void.
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I can't reproduce this issue either.
Based on recent tickets, MC-228254 (screenshots), and in my own testing,
this appears to be an issue with modded clients, specifically OptiFine.

Please attach a screenshot of this occurring while the F3 debug screen is enabled.
This issue is being temporarily closed as Awaiting Response. Once the requested information has been delivered, the report will be reopened automatically.
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Thank you for your report!
We're tracking this issue in MC-227996, so this ticket is being 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.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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Could not reproduce. Seems to be a performance issue in your end.