I installed 19.04 in a VM with full disk encryption, then upgraded libblockdev from buster-proposed-updates (2.20-7+deb10u1), rebooted, and I was able to successfully change the passphrase in gnome-disks.
I installed 19.04 in a VM with full disk encryption, then upgraded libblockdev from buster- proposed- updates (2.20-7+deb10u1), rebooted, and I was able to successfully change the passphrase in gnome-disks.