This is because of a module that moved from calamares-extensions to calamares. calamares-extensions 3.3.11 solves the issue, however a tarball of it hasn't been published yet. I've pinged the Calamares developers to see if a full release of calamares-extensions 3.3.11 can be made. Once that's done and packaged up, this should no longer be a problem.
pgpHLOnGOJWye.pgp
Description: OpenPGP digital signature
