The patch notes can be seen below in full:
• Fixed an issue with Deceased Scouts not appearing as often as intended.
• After having one of their Deceased Scout corpses scavenged, players will no longer receive a negative-effect parasite on startup.
• Fixed an issue where the Ophion boss might disappear after a player uses the Reconstructor during the fight.
• Fixed a rare audio bug causing loud noises during combat.
• Fixed a small number of issues where players might become stuck in various rooms.
• Fixed several issues where the player might encounter a black screen during the credits or whilst playing.
• Multiple fixes for rare crashes during gameplay.
Returnal is available now on PS5.
Source – [Housemarque]