That helped loads actually, after i looked through the way Minecraft now looks at its item directory it is more restrictive then before 1.19.3 but still very stable.
I think the main issue is that the average CIT user tried to find out what happened to their textures and why some may have worked and some didn't.
The problem for most people seems to be that the files they use to seperate what items they use seem to have spaces in the name and minecraft will no longer read that.
And the main thing i figured from the directory is that even within your CIT file you will now need to copy minecraft's normal directory.
Where before you could just have random names and spaces in your file names in CIT you can no longer do this,
the simple solution is just to change your files to assets/optifine/cit/items/specificitem
So now in CIT you'd need to make an items folder so minecraft can still read it and have no spaces within the next folder that contains your texture and properties file.
Mojang did indeed just try and optimize the directory process by limiting what it can search for and find.
So as a final example to anyone who has this problem after changing to 1.19.3 and hasn't found out what happened yet.
Change your file directory to,
assets/optifine/cit/items/(specificitem)/ And within the specific item folder you created for your texture you put your properties and png files. Keep in mind it won't recognize space bars anymore.