Housemarque has dropped off Returnal update 1.003.004 for PS5, which allows all save games to be played safely and includes a fix for a Trophy issue and keyboard exploit. It follows the release of Returnal update 1.003.003, which was pulled shortly after release.
You can read more details from Housemarque below.
- Some game saves will have become corrupted with Patch 1.3.3, but maintained their file size. Players with those save games are able to safely continue their progress after installing Patch 1.3.4, without the need for using a backed up save game.
- Unfortunately other save games will have been effectively “deleted” by Patch 1.3.3, with their file size reducing to 0KB. These save games are not directly salvageable by Patch 1.3.4, without a backup save game available.
- In those cases, please try using a backed up save from PS+ if available, after installing Patch 1.3.4. With an intact save game from PS+, players can safely restore and continue playing with Patch 1.3.4 installed.
- Depending on the console settings, the cloud save may have been overwritten by the “deleted” save game noted above. If this is the case, progress will remain unsalvageable, even with Patch 1.3.4.
Source – [Housemarque]