I've also tried the gui with no luck, rescan and so on.
It's an old wallet, but it should work with sweep_unmixable or sweep_all, but it doesn't.
Any help would be appreciated. Thanks
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This seems to be a bug in sweep_unmixable, as evidenced from this recent PR:
I think you should be able to use the latest release-0.12 code, and it should then work.