Snap packages that use core18 don't work at the moment. When I try to run any of them (such as chromium) I get this error:
execv failed: No such file or directory

The maintainer of one of the snaps with the issue pointed me to a bug report where it was said that the issue needs to be addressed in snapd in the distro. Apparently Fedora 29 has the same issue.

Thanks. You just made a lot of people happy.