In /common/ff8/tonberry i do have collisions.csv hash2map.csv AND a hash1map.csv
I'm not sure if this is ok or needs to be sorted. Anyway, i made some tests: having all 3 files, 1 or 2 of them (regardless which ones), or none of them doesn't change background appearance at all (actually, it seems to have 0 impact on any of the mods i've installed).
But then again, i know nothing of how all of this really works. So, uh, maybe it's all as it should be.