I have played plenty of PS3 roms in the past but never ran into such odd issues with a game. The EU disc rom did work but for some reason none of the DLCs worked, even if they are designated EU dlcs but it seems like some DLCs aren't even available in the EU such as Tekken Tunes DLCs? Later on I found a US digital PSN pkg but there the DLCs also didn't work and I even had missing texture issues and the game told me that downloadable content couldn't be loaded.
The US disc roms I found online all seem to not work since they miss several data files such as data050 and the game says its corrupt when it loads in RPCS3.
I know that this question probably sounds dumb and like I am a noob but I already have downloaded several US and EU versions, including a digital PSN rom and none worked fully.
