did some google-fu. it seems that the crashes are most likely related to the large hole opened up in the map.
Some say to skirt around it to get to the tunnel straight while some report that just ignoring the 3 giant snake monsters to be useful in avoiding the crash. It seems to be an ps5 specific unpatched bug.
If that's not where you are crashing, try putting the ps5 in offline mode while playing but be sure to put it back up in online before the endings.
Damn, that was some quick googling, thanks! Now that you mention it the crashes seem to prone occur when entering that area. I saw someone in a reddit thread mention having the camera directed at water falls also seem to cause crashing on PS5 and since there are a few in that area I guess it's possible that it also contributes to the issue. I guess I'll just try remembering to quicksave often and avoid the areas prone to cause the crashing.
I tried moving the game off my external HDD onto my M2 SSD, that way the game will at least load/boot a few milliseconds faster than before inbetween the crashes, heh.
Would be sweet with a PS5 patch/version of this game to sort out the crashing and bring some QoL upgrades like higher resolution and LoD transitions. Fast traveling would also improve greatly if it could take full advantage of the storage speed.
NieR Automata really makes me wanna check out Replicant as well, so I'll probably get back to this OT at some point with less off topic posts xD
Edit: The game got a patch today (1.07). I can't help to wonder if me sending all those crash reports might have helped them solving a few bugs.