When the projector displays stuff it displays fine but chunks start flashing. I'm using optifine and I'm on Linux, can that be the reason?

Are you using other mods? What does the flashing look like?

Modlist is quite long. It's a homebrew modpack:
appleskin-forge-mc1.18-2.4.0.jar
corpse-1.18.2-1.0.1.jar
flywheel-forge-1.18-0.6.2.jar
MouseTweaks-forge-mc1.18-2.21.jar
Quark-3.2-349.jar
AutoRegLib-1.7-53.jar
createaddition-1.18.2-20220419a.jar
hexcasting-0.7.1.jar
NethersDelight-1.18.2-2.2.0.jar
sedna-1.18.2-forge-1.0.13+7355dbe.jar
buildinggadgets-3.13.0-build.5+mc1.18.2.jar
createdeco-1.2.7-1.18.2.jar
ImmersiveEngineering-1.18.2-8.0.1-147.jar
oc2-1.18.2-forge-0.1.7+6a003fc.jar
selene-1.18.2-1.15.1.jar
ChiselsBits-forge-1.18.2-1.2.84-universal.jar
create-mc1.18.2_v0.4.1.jar
jei-1.18.2-9.5.5.174.jar
Patchouli-1.18.2-67.jar
sit-1.18.2-1.3.2.jar
Clumps-forge-1.18.2-8.0.0+8.jar
create-stuff-additions1.18.2_v1.1.5.jar
kotlinforforge-3.2.0-obf.jar
paucal-1.18.2-0.3.4.jar
StorageDrawers-1.18.2-10.2.0.jar
Controlling-forge-1.18.2-9.0+19.jar
FarmersDelight-1.18.2-1.0.4.jar
markdown_manual-1.18.2-forge-1.2.1+59006bb.jar
pneumaticcraft-repressurized-1.18.2-3.1.5-70.jar
supplementaries-1.18.2-1.3.6.jar

Most of these mods don't mess with rendering but they may still mess with rendering. Here is a picture of the flashing. It seems to only happen when i look down more than 55 degrees

I am tempted to say this is caused by other mods but I haven't touched OC2 in quite a while so I can't confirm

Optifine does some odd stuff, and it's closed source. I would use magnesium (port of sodium, great fabric mod) if possible

Would recommend trying without optifine, I can make no guarantee for compatibility with optifine.