So while trying to figure out why one of texture replacements in Ao PSP wasn't working despite being present in folder and hashed I ran into this situation.
View attachment 180874
I think some of the file names might be in different encodings, and it results in them not being recognized by "textures.ini" file. How to check them all and fix them automatically I do not know.
EDIT: by typing letter "c" into search bar it seems differently encoded files will show like this.
View attachment 180984
Fully retyping file names of these affected files should fix these textures not displaying in PPSSPP.