Manipulating primary key and subkeys at once with key *...

[gnupgpacker]

Hello,
possibly there is a bug present if manipulating a GnuPG key with subkeys
attached!?

Example:
We want to expire validity of primary key and all subkeys.

C:>gpg --edit-key 7BF4xxxx
gpg> expire 
This command modifies the date for primary key only, subkeys are NOT
affected.

BUT:
C:>gpg --edit-key 7BF4xxxx
gpg> key *
gpg> expire
This command only modifies the date for all subkeys, primary key is NOT
affected.

In my opinion
gpg> key *
should select all included key parts, primary key + all subkeys, but it
doesn't!?

So is it 'by design' (not logical, why?) or is it a bug in GnuPG-2.2x?
How to select all key parts (sec + ssb + ssb + ssb...)?

Thx + regards, Chris