GOG Cloud saves not working when launching via steam-shortcut

I noticed, when adding a shortcut for a gog-game via heroic to the steam-library, heroic will not synchronise the gog cloud when launching from aforementioned shortcut. The cloudsave-sync itself does work when launching via heroic directly, but doing so eliminates the benefit of the steam-decks' gaming-mode. The launcher is asking whether or not to update, when one is available during launch via steam-shortcut, though cloud-saves don't appear to be working.
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