If you do not fix the game so it works on my ps5 i will take you to court it is illegal to do what you are doing! You are well aware of that the game is broken so fix it! If i where you I would hastily contact me via my email linked to this account and explain what you are going to do about this because I’ve had it with money grabber devs man I’m furious with you guys!

So I did some bit of searching and found out that Multiple games across several different developers have problems with the PS5 backward compatibility not working.

AKA the fault doesn't lie with Amplitude studios nor PLAYDIGIOUS.
Instead Sony is the most likely company responsible for this problem.

try asking at their forums, maybe they can help.

Sony never guaranteed full backwards compatibility. The real question is why did it end up in "compatible" list of the store.