While using a copy of my world and exploring 1.16 update I came across multiple nether fortress' that havent loaded in properly perhaps due to the new biomes found close by. Sometimes it is only a partial fortress like 1 tower and blaze spawner othertimes it is still a small secrion of a fortress that is still missing sections like shown in the pictue.
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is duplicated by 5
relates to 2
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Could you provide an example seed and coordinates please?
Could you provide an example seed and coordinates please?

181, 71, 327
-1389161317

181, 71, 327
-1389161317

Confirming ticket based on the analysis given by myself and confirmed by Auldrick’s test of the seed and coordinates provided. I agree this is likely a “won’t fix” issue.
If you have a copy of the world available, you might like to upload a copy of it for investigation.
On Windows 10 you can use the Export world feature.
On Android or iOS you need to use a file explorer to navigate to Device storage > games > com.mojang > minecraftWorlds
On Xbox or Switch the only way is to upload it to a Realm, and then download the world on Windows 10 or Android/iOS. (Please do not purchase a Realms subscription just to provide a world to us - but if you have a Realm already this may be a viable option if you wish to do so.)
If the world is larger than 10MB you can upload the world to OneDrive or a similar file sharing site, and then share the link.
If you have a copy of the world available, you might like to upload a copy of it for investigation.
On Windows 10 you can use the Export world feature.
On Android or iOS you need to use a file explorer to navigate to Device storage > games > com.mojang > minecraftWorlds
On Xbox or Switch the only way is to upload it to a Realm, and then download the world on Windows 10 or Android/iOS. (Please do not purchase a Realms subscription just to provide a world to us - but if you have a Realm already this may be a viable option if you wish to do so.)
If the world is larger than 10MB you can upload the world to OneDrive or a similar file sharing site, and then share the link.
Thank you for your report!
However, this issue has been closed as Won't Fix.
This is likely to be the result of existing world generation not exactly matching the newly generated chunks. New chunks and world generation should be working though, and if you have any examples of newly generated worlds that are broken, please file a new report with seed and screenshots.
If you'd like to post a suggestion or give further feedback, please visit the Minecraft Feedback Site or choose a link below.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki
Thank you for your report!
However, this issue has been closed as Won't Fix.
This is likely to be the result of existing world generation not exactly matching the newly generated chunks. New chunks and world generation should be working though, and if you have any examples of newly generated worlds that are broken, please file a new report with seed and screenshots.
If you'd like to post a suggestion or give further feedback, please visit the Minecraft Feedback Site or choose a link below.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki