Looks like there's still something weird going on with dnf. anaconda is showing "Warning checking software selection" in the GUI, and in packaging.log we have:

DEBUG:anaconda.modules.payloads.payload.dnf.validation:Resolving the software selection.
INFO:anaconda.modules.payloads.payload.dnf.dnf_manager:Including specs: ['@core', 'kernel']
INFO:anaconda.modules.payloads.payload.dnf.dnf_manager:Excluding specs: []
ERROR:dnf:Module or Group 'core' is not available.
ERROR:anaconda.modules.payloads.payload.dnf.dnf_manager:Failed to apply specs!
Problems in request:
missing groups or modules: @core
DEBUG:anaconda.modules.payloads.payload.dnf.dnf_manager:Resolving the software selection.
DDEBUG:dnf:timer: depsolve: 41 ms
INFO:anaconda.modules.payloads.payload.dnf.dnf_manager:The software selection has been resolved (184 packages selected).
DEBUG:anaconda.modules.payloads.payload.dnf.validation:Resolving has been completed: ValidationReport(error_messages=[], warning_messages=['Some packages, groups or modules are missing.\n\nProblems in request:\nmissing groups or modules: @core'])

In anaconda.log we have:

02:36:23,087 DBG ui.lib.software: Selecting the '' environment.

which also looks weird. Not sure exactly what's going on, but it's not right.