FlashTeens
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Please note that the phenomena as mentioned in this bug report is different from another chunk loading bug that we found a few years ago: MC-190836
This bug (MC-297378) can happen only after 1.21.2 (inclusive), and we suspect this one to be a side-effect from the minecart improvement update (as said in my previous comment)
On the other hand, the MC-190836 one seems to also happen on some earlier versions after 1.14, and we consider it to be more likely to depend on hardware performance.
Therefore, please investigate the root cause of these two bugs separately. We do NOT consider these two bugs as duplicates. Thank you.
Similar issue can be reproduced in 25w20a, as shown in Phoenix SC’s video on YouTube: https://youtu.be/WFf-kUsIXPg (5:46-6:07 of the video)
Added the debug info using the /jfr command while reproducing this bug again today. It did happen in the same way.
[media]I have tried replacing the Command #2 from the description:
/execute as @e[type=minecart,tag=debug] at @s run data merge entity @s {Motion:[0.0,0.0,1.0]}
with any of the following equivalences:
/execute as @e[type=minecart,tag=debug] at @s run data modify entity @s Motion set value [0.0,0.0,1.0]
/execute as @e[type=minecart,tag=debug] at @s run data modify entity @s Motion[2] set value 1.0
But none of these alternatives help; I can still always reproduce the same issue.
So, I still guess it could be a chunk loader issue instead of anything to do with syntax changes across Minecraft versions.
Though I did not use the experimental minecart improvements to reproduce the bug, could it still be the culprit why the chunk loader does affect non-experimental gameplay? (since this experimental feature was also introduced in 1.21.2.)
It still happens on 1.21.6.