Iron Golem lighting appears bugged

[0CCULTIST]

https://files.catbox.moe/z2lmgn.mp4

Iron Golems have flickering lighting/emissions under sunlight based on their angle to it. Appears to be irrespective of the camera angle or player position relative to the golem.

Mesa 25.0.7-2 (+25.2.6)
RX 9060XT
Minecraft 1.21.8
Iris 1.9.6
Complementary r5.6.1

[0CCULTIST]

Actually this seems to occur even with PBR set to "Basic", just much less noticeable.