Bug report - https://bugs.launchpad.net/calamares/+bug/1864787 or calamares
error " “sfdisk --force --append /dev/sda”" (recorded as impacting four total users, that could get around issue too)
@wxl recently asked for exploration of this issue.
@leok and I have talked about it, and likely best approach forward is (following is cut/pasted from elsewhere, slight editing)
Purpose of this, is to let @wxl see what is intended, it also allows others to provide insight, make comment (flaws/improvements in approaches etc) and have an easy place for documenting what is done.
As users were able to work around the issue (myself included) I don’t consider it a priority task, though with feature freeze on 25 February on hirsute…