Minecraft Version: release fabric-loader-0.12.12-1.18.1
Litematic Version: litematica-fabric-1.18.0-0.9.0
Malilib Version: malilib-fabric-1.18.0-0.10.0-dev.26

All the schematic blocks are invisible but still are able to cast shadows and when I move around in the schematic my minihud mod shows that there are blocks there but not the F3 menu.

Unfortunately shaders break the schematic rendering once again... Disabling shaders and then toggling the schematic rendering or nudging it should make it render.