Whilst the expiration date of an expired pgp key can be extended into the future - kgpg can't do this for its subkeys -making the whole thing useless :-( Reproducible: Always
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I have also several GnuPG keys which I edited with KGpg. Unfortunately, the subkeys were not taken into account by KGpg when setting the expiry date. Subsequent adjustment of the subkeys is also not possible.