Hello! The best fix for this bug report is likely just to upgrade to a newer upstream udisks2.
The libbytesize package was just accepted in NEW. The volume-key package is still stuck in NEW. the libblockdev package still needs to be uploaded for NEW processing. Once thats done, udisks2 should be possible to update to a newer release that switches from spawning and screen-scraping command-line utilities to using libblockdev. Once that's done, this bug report can just be closed. Regards, Andreas Henriksson