Nassim Jahnke

Did you happen to quit the world/game while those chunks were being loaded (MC-295409)?

Among other entities, none of the mobs from the end dimension received texture updates, this lack of change doesn’t really describe an inconsistency or gameplay issue. If you have ideas or wishes for specific mobs to be updated, please use the feedback site.

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However, this issue is being closed as Invalid. The bug tracker is only for bugs, not feature requests.
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However, this issue is Invalid.

Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.

• Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.

• A world which had previously been opened with a modified client might be corrupted. Please try reproducing the issue in a newly generated world.

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• If you have problems on large servers like Hypixel, please contact them first as they run modified server software.

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Thank you for your report!
We're tracking this issue in MC-280309, 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.

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Thank you for your report!
We're tracking this issue in MC-127970, 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.

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Thank you for your report!
However, this issue is Invalid.

Your Minecraft version is outdated. We only take issues for the latest release and the latest snapshot.
Please update to the latest version as it includes the newest fixes. If you still have this problem after updating, then please create a new issue.
In case of a game crash, please also attach the crash report found in minecraft/crash-reports/crash-<DATE>-client.txt.

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Please make sure you are using an unmodded version of Minecraft through the default launcher, using the latest version of Minecraft. The same applies to the server you are connecting to, as these servers are not running latest or vanilla. 1.21.4 does not run on Java 17 but should come with its own bundled version of Java 21. Otherwise this is likely to stem from something outside of the game

Thank you for your report!
However, this issue is Invalid.

You have posted a feature request or a suggestion. This site is for bug reports only.
For suggestions, please visit The Minecraft Feedback Site or visit the Minecraft Feedback Discord server.

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Thank you for your report!
However, this issue is Invalid.

Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.

• Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.

• A world which had previously been opened with a modified client might be corrupted. Please try reproducing the issue in a newly generated world.

• Any plugin issues need to be addressed to the creator of the plugin or resource pack.

• If you have problems on large servers like Hypixel, please contact them first as they run modified server software.

Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support (Technical Issues) – 📧 Microsoft Support (Account Issues)
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki

Thank you for your report!
However, this issue is Invalid.

Simply stating that "My game is laggy" is not helpful for Mojang to diagnose your issue. If you can pinpoint a specific cause when lag happens for you, please open a new report for that specific issue. If you think this might be a hardware issue please contact Community Support as they might be able to help with your issue.

Keep in mind that Mojang is constantly optimizing the game and simply playing the game provides feedback to Mojang on which parts cause performance issues. To learn more about this, head here (section "Telemetry") for more information.

Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support (Technical Issues) – 📧 Microsoft Support (Account Issues)
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki

Thank you for your report!
However, this issue is Invalid.

Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment using the latest release or snapshot version, please recreate the issue.

• Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.

• A world which had previously been opened with a modified client might be corrupted. Please try reproducing the issue in a newly generated world.

• Any plugin issues need to be addressed to the creator of the plugin or resource pack.

• If you have problems on large servers like Hypixel, please contact them first as they run modified server software.

Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support (Technical Issues) – 📧 Microsoft Support (Account Issues)
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki

Thank you for your report!
We're tracking this issue in MC-270919, 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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📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support (Technical Issues) – 📧 Microsoft Support (Account Issues)
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki

Thank you for your report!
However, this issue is Invalid.

Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.

• Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.

• A world which had previously been opened with a modified client might be corrupted. Please try reproducing the issue in a newly generated world.

• Any plugin issues need to be addressed to the creator of the plugin or resource pack.

• If you have problems on large servers like Hypixel, please contact them first as they run modified server software.

Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support (Technical Issues) – 📧 Microsoft Support (Account Issues)
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki

Thank you for your report!
However, this issue is Invalid.

Your Minecraft version is outdated. We only take issues for the latest release and the latest snapshot.
Please update to the latest version as it includes the newest fixes. If you still have this problem after updating, then please create a new issue.
In case of a game crash, please also attach the crash report found in [minecraft/crash-reports/crash-<DATE>-client.txt|https://minecrafthopper.net/help/finding-minecraft-data-folder/].

Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support (Technical Issues) – 📧 Microsoft Support (Account Issues)
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki

Thank you for your report!
However, this issue is Invalid.

Your Minecraft version is outdated. We only take issues for the latest release and the latest snapshot.
Please update to the latest version as it includes the newest fixes. If you still have this problem after updating, then please create a new issue.
In case of a game crash, please also attach the crash report found in [minecraft/crash-reports/crash-<DATE>-client.txt|https://minecrafthopper.net/help/finding-minecraft-data-folder/].

Modified versions are not accepted for bug reports either.

Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support (Technical Issues) – 📧 Microsoft Support (Account Issues)
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki

Thank you for your report!
However, this issue is Invalid.

Simply stating that "My game is laggy" is not helpful for Mojang to diagnose your issue. If you can pinpoint a specific cause when lag happens for you, please open a new report for that specific issue. If you think this might be a hardware issue please contact Community Support as they might be able to help with your issue.

Keep in mind that Mojang is constantly optimizing the game and simply playing the game provides feedback to Mojang on which parts cause performance issues. To learn more about this, head here (section "Telemetry") for more information.

Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support (Technical Issues) – 📧 Microsoft Support (Account Issues)
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki

Thank you for your report!
However, this issue is Invalid.

When considering bugs, you need to show their in-game impact and compare it with previous behavior. In this case, the code might look slightly different, but as far as we can see, the behavior is the same and is more of a feature suggestion.

Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support (Technical Issues) – 📧 Microsoft Support (Account Issues)
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki

None of these were present in the version before the fix (being 1.21.3), so your observed behavior is not a regression or a bug - your expected behavior however would be. As far as I can see, it was reverted to how it was before. Can you elaborate on what you mean by "this did not happen"?

If there was a regression around elytras, please make a separate report and explain that example in more detail

Have you tried disabling sync-chunk-writes in the server.properties file? The option was introduced a few versions ago and I believe this defaults to true on Windows to fix some other issues