Today in "diagnostic messages I've not seen before", comes this beaut
edit: solved -- see follow-up
Today in "diagnostic messages I've not seen before", comes this beaut
edit: solved -- see follow-up
thanks to a question @and1bm asked, I found the problem: it really is an older agent: I forward gpg-agent using SSH, and Debian (where the diagnostic was emitted) has a newer gpg than my workstation has.
For those wanting to know why I do that, I wrote that up a year ago: https://jpmens.net/2025/04/04/forwarding-gnupg-agent-over-ssh/