For me it seems it is not the same bug as #529502 because there is only a bug at the gui and not at the commandline "Manually running cryptsetup luksClose udisks-luks-uuid-[...] afterwards works as expected.".
But here it is the commandline-tool that is not working.
I got the same problem with the commandline - everything is unmounted but it says device is busy.
For me it seems it is not the same bug as #529502 because there is only a bug at the gui and not at the commandline "Manually running cryptsetup luksClose udisks- luks-uuid- [...] afterwards works as expected.".
But here it is the commandline-tool that is not working.
I got the same problem with the commandline - everything is unmounted but it says device is busy.