Okay, some log entries:
8 Jun 2023 20:27: Backend event: Get - Started: duplicati-20230606T020000Z.dlist.zip.aes (36.30 MB)
8 Jun 2023 20:27: Backend event: Get - Completed: duplicati-20230321T020000Z.dlist.zip.aes (36.28 MB)
8 Jun 2023 20:26: Backend event: Get - Started: duplicati-20230321T020000Z.dlist.zip.aes (36.28 MB)
8 Jun 2023 20:26: Backend event: Get - Completed: duplicati-20220910T102949Z.dlist.zip.aes (33.26 MB)
8 Jun 2023 20:26: Backend event: Get - Started: duplicati-20220910T102949Z.dlist.zip.aes (33.26 MB)
8 Jun 2023 20:26: Backend event: Get - Completed: duplicati-20221018T020000Z.dlist.zip.aes (33.29 MB)
8 Jun 2023 20:23: Backend event: Get - Started: duplicati-20221018T020000Z.dlist.zip.aes (33.29 MB)
8 Jun 2023 20:23: Backend event: Get - Completed: duplicati-20230109T131938Z.dlist.zip.aes (33.60 MB)
8 Jun 2023 20:23: Backend event: Get - Started: duplicati-20230109T131938Z.dlist.zip.aes (33.60 MB)
8 Jun 2023 20:23: Backend event: List - Completed: (7.46 KB)
8 Jun 2023 20:23: Backend event: List - Started: ()
8 Jun 2023 20:23: The operation Test has started
It is now hung. Even clicking on the cancel button does nothing.