MC-259666 doesn't seem to be fully fixed. The stall still occurs, though only when reloading such resource packs in a certain order.
To reproduce this issue, you need to have another resourcepack (that doesn't have a custom atlas) already loaded, and then load the Hoplite resource pack first before loading the MCC Island resourcepack. Presumably, because the Hoplite pack is smaller than the latter.
Steps to reproduce:
1. Load a resourcepack.
2. Load Hoplite's resourcepack.
3. Load MCC Island's resourcepack after unloading Hoplite's.
Result: Severe micro stutters would occur. Only way to fix this is to reopen the game. ❌
Alternatively:
2. Load MCC Island's resourcepack first.
3. Load Hoplite's resourcepack after unloading MCC Island's.
Result: No micro stutters at all, no matter what order you load these resource packs afterwards. ✔
New video demonstrating the issue: https://youtu.be/RAHWb9uYSi4
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I was also unable to reproduce this earlier when the report was made. Please record a video of this happening and attach it to this report.
If anybody isn't able to produce it, make sure when you load the MCC Island pack you are already in a world, not on the title screen. As well as unloading the pack when joining Tubnet. Do not join Tubnet with the pack enabled. As well as it being a Mac specific issue. Let me know if yall still have problems reproducing.
If this is still a problem for you in 1.20.4 or the latest snapshot, please update the affected version(s) as well as the description with reliable reproduction steps (tubnet.gg is offline).
Cannot reproduce. Someone else please try to reproduce this.