Just to be sure the --extra-snaps/--snap functionality didn't regress, on disco I have performed two quick core image builds: one with --snap=hello=beta to install an additional hello snap from beta (new syntax) and another one with --extra-snaps=hello (old syntax). Both image builds went fine with the hello snap installed additionally on the images. Using --extra-snaps displayed a deprecation warning (as intended) but other than that worked as previously.
Just to be sure the --extra- snaps/- -snap functionality didn't regress, on disco I have performed two quick core image builds: one with --snap=hello=beta to install an additional hello snap from beta (new syntax) and another one with --extra-snaps=hello (old syntax). Both image builds went fine with the hello snap installed additionally on the images. Using --extra-snaps displayed a deprecation warning (as intended) but other than that worked as previously.