Installed GOG games not shown while offline

Hi all!
When I start Heroic offline, only the games that I added manually are displayed. The games from GOG that I installed "automatically" are missing. The per-game "play offline" setting has no effect there.
I'm on Linux and using the Flatpak version (2.9.2). My guess is that the issue is mentioned at the line "INFO: [Frontend]: No cache found, getting data from gog...", but why is there no cache and how can I make sure one is created?
Thanks in advance!
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