Dunno if just me, but when I enable your Resource pack with Distant Horizon I get purple blocks everywhere, when I disable the Resource pack and restart the game everything goes back to normal.

I hope this can be fixed, would love to use both the mods and your resource pack.

This is weird, this resource pack is not the cause for sure. This is caused by rendering, so I have some guesses on what could be the issue. What mods are you using?

https://www.curseforge.com/minecraft/modpacks/nplx-thermal-create

Cloud not find out what causes it, if you add the missing mod it should happen again.