You can see the full Returnal update 1.003.006 patch notes below, straight from Housemarque:
Multiple stability fixes addressing rare crashes.
Fixed issue with pre-order suits occasionally blocking items and doors.
Fixed incorrect healing behaviour.
Fixed issues with custom controller mappings.
Numerous minor fixes
Fixed issue with corrupted save game.
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Hopefully, this patch should arrive safely after the last one was released and subsequently ended up corrupting a number of players’ save data, causing it to be pulled. This was then fixed with a subsequent patch a day or so later. If you haven’t had a chance to check out the game yet, read our review to see why it is a strong title you should absolutely play.