Emissive ore flickering

I'm running 1.20.2 Fabric with Iris 1.6.10. I have the Fabulously Optimized modpack which includes Indium, Continuity, ETF. When I use an emissive ore resource pack, some but not all ores in a group will aggressively flicker. Something interesting is that all sides except for the side facing North will flicker.

What I've tried:
  • BSL and Complementary shaders
    • integrated vs labPBR
    • Turning off connected textures/custom block layers in Continuity
    • Turning off anti-aliasing
The two resource packs I've tried so far:
(https://www.curseforge.com/minecraft/texture-packs/visible-ores)
(https://modrinth.com/resourcepack/new-glowing-ores)

My guess is either a setting that I'm overlooking or that the resource packs are strictly Optifine.
flickering.gif
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