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(Edited 1 time)

Sorry Amos, I should've been clearer - after reinstalling the game, it found the manifest fine. Beforehand it didn't. My suspicion is that renaming was the cause of the error, but I haven't verified that. It would mean the repro would hypothetically be:

  1. Create a game with a manifest
  2. Install the game, note it finds the manifest fine
  3. Rename the game
  4. Publish an update to the game
  5. Update the game in the itch app
  6. Launch the game - it doesn't find the manifest
  7. Uninstall and reinstall the game - it finds the manifest

This is basically more or less what I did, I think. But there were other factors involved probably, such as updating the itch app itself somewhere in the middle there.