If you look at the mooshroom mushroom from a distance, you can see it flickering. You can also see that the mushrooms render incorrectly when you include the resource pack.
Steps to reproduce:
Enter a world on the 1.21.70.22 Preview.
Summon a Mooshroom.
Fly 50 blocks away.
Use a spyglass to look at the Mooshroom.
Observe z-fighting on the Mooshroom's back mushrooms.
This issue is caused by the mushrooms rendering both sides at once instead of only one side at a time. That's why the mushroom in the Pattern Texture Pack screenshot appears to have two stems, both sides are rendering at once.
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I can reproduce this issue without any resource packs. Reproduction steps:
Enter a world on the 1.21.70.22 Preview.
Summon a Mooshroom.
Fly 50 blocks away.
Use a spyglass to look at the Mooshroom.
Observe z-fighting on the Mooshroom's back mushrooms.
This issue is caused by the mushrooms rendering both sides at once instead of only one side at a time. That's why the mushroom in the Pattern Texture Pack screenshot appears to have two stems, both sides are rendering at once.
Please provide the resource packs to reproduce this issue.