Balloon model renders wrong upon floor contact

[odd sparrow]

This is only in vanilla. I use Iris and it doesn't happen. For context, these balloons are on a powered gold pressure plate model, but if they are directly on the ground, it renders with these weird shadows. The shadows do not happen if I make the green and yellow balloons 1 lower, and the red one just as low as those after, so it seems to be with how tall the model itself is. It's also only happening north and south. Any idea what is causing this or if there's a fix?

[river warren]

Welcome to the help forum!

Please make sure to read #1029373817119838218 as it may answer your question!

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[bitter saddle]

!faq java block dark

[river warren]

FAQ

Java: Block Dark

If your models have black spots try these steps:
Opaque rendered block will have black spots if:

• They are connected to a other block in the same render way
• If elements are outside the 16x16x16 area
  There are some ways to remove the black spots:
• Disable AO (Ambient Occlusion)
• Disable shading
• Moving the black elements or rotate them
• Disable smooth lighting
• Use OptiFine (helps a ton with the crappy shading of mc)
• Centering the origin point to the element (or moving the origin point somewhere else sometimes works too)
• Setting proper cullfaceing
  Sometimes one of these steps helps, sometimes multiple of them help, and sometimes it is unchangeable.
  If nothing works to fix it, then you should use a transparent/translucent rendered block instead, or place it next to a transparent/translucent rendered block.

[odd sparrow]

How do I disable AO or shading?