According to the developer of ModernFix, this is unfixable from their side due to how this mod makes latex block overlays work.
See embeddedt/ModernFix#155

I can't seem to replicate this in the dev environment. Though, I am using version modernfix v5.2.5.

Hold on, lemme retest this with an update to date version.

Still happening for me, you sure you enabled the dynamic resources thing in the configuration of ModernFix? @LtxProgrammer
https://github.com/embeddedt/ModernFix/wiki/Dynamic-Resources-FAQ

Almost got it. Need a way to register textures.