My offline master key only has [C] and I have three subkeys with [S], [E] and [A] capabilities on a smart card.
I used to sign keys by using the subkey with [S] only. This is not possible any more because of T3844 with Version 2.2.5+
As smart cards only have three slots for [S], [E] and [A] it is not possible to add the master key with [C] to it to be able to sign keys with the smart card.
A solution would be to abandon the current [S] subkey, change the capabilities of the master key from [C] to [SC] and put it onto the smart card.
The change of capabilities / usage flags is currently not possible, but there is a patch which makes this possible, see external link.
Could you please implement this officially?
Thanks for the many improvements in the last years which make the usage of smart cards feasible!