Elden Ring's Autosave Launched Busted On PS5 (Now Fixed)

At launch, Elden Ring publisher Bandai Namco warned players not to leave the game in rest mode, lest it messed with the autosave. A patch has since addressed it.
FromSoftware’s torture chamber raises a long-standing issue with the PS5’s rest mode

Elden Ring PS5, PS4 Patch 1.10 Offers PvP Balance Changes, Bug Fixes

Elden Ring patch fixes PS5 save bug and some PC issues

Elden Ring PS5 save bug patched, PC performance also targeted - Polygon

Elden Ring PS5 Saves Being Lost

Elden Ring patch fixes PS5 save bug and some PC issues

Elden Ring Patch Addresses Graphics Cards, but Not Arcane Weapons

Elden Ring patch fixes PS5 save bug

Don't leave your PlayStation 5 in sleep mode if you're playing Elden Ring

Elden Ring (PS5) Review — Forever Classic Games

Elden Ring (PS5) Review — Forever Classic Games

Elden Ring (PS5) Review — Forever Classic Games

First Hogwarts Legacy Update Gets Patch Notes

Elden Ring Patch Addresses Graphics Cards, but Not Arcane Weapons

Patch 1.02.2 notes for PC and PS5 : r/Eldenring