The name of the game is "South Park The Fractured But Whole" and I bought it on Epic Games Store a few months ago.

It is listed in the Epic Games library but GOG Galaxy doesn't find it, even when syncing plug-in again and again, also tried to reconnect the Epic plugin but nothing changes. Other games listed in the library seem to be ok and detected by GOG Galaxy.

Does anyone have the same problem ?

Sheltered game from Epic Store is not correctly detected in Galaxy, it appears other screenshots.

I checked my "recent added games" tab and South Park is correctly detected.
No problems with Sheltered.
Thanks.

Have uou tried manually adding? I'll add a screenshot:

Yeah... Manually adding them works, but that's not the expected behaviour, obviously.