[1.21.3 Bug] Entities and entity block models sometimes flash black

[gmferise]

Steps to Reproduce

Walk around entities. Possibly happens when chunks are loading.

OptiFine Version

1.21.3 Pre11

Installation Method

Jar installer

F3 Debug Screenshot

Bonus screenshot of issue on regular entity

[sp614x]

Does it happen with Dynamic Lights, Render Regions and Fast Render disabled?

[gmferise]

@sp614x I was able to trigger it with just Render Regions enabled and the rest you listed disabled. Once I disabled Render Regions I could not trigger the bug.

To be fair, the tooltip does say "Not recommended for integrated graphics cards" which yeah this laptop only has integrated graphics.

[sp614x]

Render regions should only affect terrain rendering, not entities.
This may be a driver bug or some side effect.