built a 23x23 portal and went to the nether in my lets play world.
used an existing portal to get back to the over world and my world would only load to normal view distance with empty space everywhere else / would not load chunks any futher than that, i quit and reloaded the world and everything was still there,
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Not an issue with the portal, issue with render distance/rendering chunks.
Duplicate of MC-30483, please use the search function to see if your bug has already been submitted. Currently over 57% of tickets are being resolved as duplicate.