By the way, other game configs seem also affected. For example, the steam cloud saves path as shown at https://github.com/ValveSoftware/steam-for-linux/issues/7512.
Hello @zzhiyi, friendly reminder that I'm a moderator for Valve's issue trackers on Github, and not a Steam developer myself. We'll need to hear from a Steam dev on how they'd like to handle this particular issue.
@kisak-valve, so is this considered a game bug for the developer side? It would be nice to have some checks for such issues on the Valve server when developers upload games.
Yes, this is a casing thing: I made a test case of several app launch configs.  The first one gives: ![image]...