transition: after importing config-channels I see puppet-modules but no classes

Hi all,
I'm fairly new to satellite and trying to perform a transition from satellite 5 to 6

like I said in the title:
after

hammer> import config-file --logfile /tmp/cfg_import.log --verbose --debug --csv-file /tmp/exports/config-files-latest.csv

I get this summary:
[....]

Summary
Failed 4 puppet_modules.
 Wrote 18 puppet_modules.
 Wrote 244 puppet_files.
 Uploaded 18 puppet_modules.

So some failed, but many succeeded.

I expect now to find all the generated puppet classes with:

hammer> puppet-class list

but unfortunately all I get is:

---|-----------------------
ID | NAME
---|-----------------------
1  | access_insights_client
---|-----------------------

I tried then:

hammer> proxy import-classes --id 1

but it changed nothing

is this correct behavior?
And if so, how can I import the generated classes, since I want to add parameters

TIA
Steffen