This was also the case for Elden Ring.
PS5 Games Tech Details - Resolution, Frame Rate, Backwards Compatibility, and more, Page 14
PSA: Armored Core 6's PS4 Version Locks at 60 FPS in PS4 Pro Settings on PS5 (Smoother than Native)
PSA: Armored Core 6's PS4 Pro Version on PS5 Appears to Run at a Locked 60 FPS
🎮 Locked News
How long will the ROG ALLY be sufficient to play the latest games? : r/ROGAlly
PSA: Armored Core 6's PS4 Pro Version on PS5 Appears to Run at a Locked 60 FPS - IGN
How to Fix non-working PS4 Games, FPKG, Physical
PSA: Armored Core 6's PS4 Version Locks at 60 FPS in PS4 Pro Settings on PS5 (Smoother than Native)
Lies of P runs great on the deck. I highly recommend it! : r/SteamDeck