7-Zip:
Google search for “does zip format allow duplicate files” says yes. Regardless, evidence above.
Unfortunately file is from long enough ago that I think the nice profiling log with it is now deleted.
EDIT 1:
… because I obtained its creating Duplicati version from manifest. Though logs are deleted, the database rotation from 2.0.8.108_debug_2024-05-08 still has relevant databases which were left after I went to the next version. One bad/good thing about fast releases is many leftovers remain.
More study could be conducted, but from looking at a list import to spreadsheet to sort by date, files in question probably came from a compact, as they follow a synthetic filelist and regular dlist:
{"Name":"duplicati-b4f01f6883c914b9a93b638978182c464.dblock.zip.aes" "LastModification":"2024-05-08T15:57:40.848Z" "Size":52392941 "IsFolder":false}
{"Name":"duplicati-b3bd15b4662364717892b374dbde33b37.dblock.zip.aes" "LastModification":"2024-05-08T15:57:45.875Z" "Size":52345853 "IsFolder":false}
{"Name":"duplicati-ib0b80714015e4b13a3596e2f41a59fd4.dindex.zip.aes" "LastModification":"2024-05-08T15:58:06.476Z" "Size":61245 "IsFolder":false}
{"Name":"duplicati-i3f9a28eebb464a19849d928b7cc0375d.dindex.zip.aes" "LastModification":"2024-05-08T15:58:06.587Z" "Size":32797 "IsFolder":false}
{"Name":"duplicati-b981a9e277fef42c28a634997aef6e6c4.dblock.zip.aes" "LastModification":"2024-05-08T15:58:35.021Z" "Size":52333837 "IsFolder":false}
{"Name":"duplicati-b243b2a1dcf9644568e1422cdceaa78fe.dblock.zip.aes" "LastModification":"2024-05-08T15:58:46.469Z" "Size":52356973 "IsFolder":false}
{"Name":"duplicati-i1f120e05d29a41ff802d59a5834810a7.dindex.zip.aes" "LastModification":"2024-05-08T15:59:28.339Z" "Size":47453 "IsFolder":false}
{"Name":"duplicati-i9d9ca8bb70cd4eb7bd492ccac08e8dde.dindex.zip.aes" "LastModification":"2024-05-08T15:59:28.502Z" "Size":47517 "IsFolder":false}
{"Name":"duplicati-b07d977016a244138b10dfe0835c94a28.dblock.zip.aes" "LastModification":"2024-05-08T16:00:42.239Z" "Size":39128221 "IsFolder":false}
{"Name":"duplicati-if3faae1809a549e29ba3a3f5240eca31.dindex.zip.aes" "LastModification":"2024-05-08T16:00:53.085Z" "Size":250877 "IsFolder":false}
{"Name":"duplicati-20240425T200809Z.dlist.zip.aes" "LastModification":"2024-05-08T16:00:56.682Z" "Size":962877 "IsFolder":false}
{"Name":"duplicati-20240508T155502Z.dlist.zip.aes" "LastModification":"2024-05-08T16:00:56.799Z" "Size":963021 "IsFolder":false}
{"Name":"duplicati-b886a86d10c2d4468873a5ad2029a5233.dblock.zip.aes" "LastModification":"2024-05-08T16:05:08.043Z" "Size":52476621 "IsFolder":false}
{"Name":"duplicati-iab4699b0234344dfaa81184d3524cd4b.dindex.zip.aes" "LastModification":"2024-05-08T16:05:55.448Z" "Size":40077 "IsFolder":false}
{"Name":"duplicati-b6c6d2a45168b49ff9f88c0ad706e5a5c.dblock.zip.aes" "LastModification":"2024-05-08T16:06:52.586Z" "Size":52481021 "IsFolder":false}
{"Name":"duplicati-iab37ddcdb8ea4ad789d96bb7b28f2894.dindex.zip.aes" "LastModification":"2024-05-08T16:07:04.154Z" "Size":71501 "IsFolder":false}
{"Name":"duplicati-bd4cd9d9703dc4e2da48e3bef5daeb2ce.dblock.zip.aes" "LastModification":"2024-05-08T16:08:10.355Z" "Size":52471741 "IsFolder":false}
{"Name":"duplicati-i8fa2700e65de436885b69e5a12682ebc.dindex.zip.aes" "LastModification":"2024-05-08T16:08:47.544Z" "Size":26973 "IsFolder":false}
{"Name":"duplicati-b622d5d9245ab4496ba0ad8af504ac4bf.dblock.zip.aes" "LastModification":"2024-05-08T16:09:27.557Z" "Size":11854989 "IsFolder":false}
{"Name":"duplicati-id1ff6a0b518f47748a81b34f8c36aecf.dindex.zip.aes" "LastModification":"2024-05-08T16:09:30.975Z" "Size":33245 "IsFolder":false}
{"Name":"duplicati-verification.json" "LastModification":"2024-05-08T16:09:41.411Z" "Size":106399 "IsFolder":false}
Dups are in:
duplicati-bd4cd9d9703dc4e2da48e3bef5daeb2ce.dblock.zip.aes
duplicati-i8fa2700e65de436885b69e5a12682ebc.dindex.zip.aes