It’s not a game bug; that’s Steam’s DRM.
Airplane mode is not offline mode. I found that out explicitly this year due to how Ubisoft’s launcher interacts with playing offline in Prince of Persia: The Lost Crown. Offline mode is found from the Internet menu in the Steam Deck interface and is very much not the same thing as just not having an internet connection, as much as that would make sense.
I didn’t break any game data. This is an OS level feature, and it just does it sometimes on boot. I’m glad you’ve never been inconvenienced by these things yourself, but this is the intended functionality.
woelkchen@lemmy.world 3 days ago
Funny how you got hit by that on an domestic train trip and I traveled abroad several times and not got that weird behaviour even once. I simply never use offline mode. On the plane I was in airplane mode and when not on the plane I was on hotel wifi, personal phone hotspot, or just not connected to any wifi. Steam also never just out of the blue validated my game data. Must be a problem on your end.
ampersandrew@lemmy.world 3 days ago
No, it’s really just a luck of the draw thing on boot.