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For some reason, which I can't seem to remember, I actually tied all my displacement maps to a func_detail.
I have this habit of saving every 10 minutes or so, and after working on my map for quite some time, I realised that I made the mistake only when I tried the compile it.
Displacement maps aren't supposed to be included or tied to ANY entities, currently now, I have no idea how to remove entities, only to change them.