Pretty much as it is, only just got litematica recently, however I can only seem to see the projection of my schematic on superflat worlds, regardless of survival or creative, and trying to load it on regular maps just shows an empty box. The schematic has loaded because if I paste into world it works fine, but its unusable on my survival world

If you see the outlines but not the schematic blocks, then one of the following is likely the cause:

• you have a Render Layer mode set to something other than All and the layer set outside of the schematic area
• you have the schematic rendering disabled (M + G)
• you are in 1.17+ with a custom world height, and you are not using the latest 1.17.1 mod version (of both Litematica and malilib), where this was fixed/changed to work properly in custom world heights

Do you happen to have render layers set to something other than All?