[Testing Update] 2020-10-14 - Plasma, KDE Apps, Browsers, Gnome 3.38. LibreOffice, Mesa

I am experiencing an issue with kmail and encrypted message filters.
When I open an encrypted multi-part message (HTML for instance), everything goes well as long as I keep the message stored encrypted.
In the moment I use a filter with a “Decrypt” action, then the decrypted message is visualised as message source (with some headers), and not rendered as HTML anymore. In case of messages coded in base64, I get the whole base64 source…

That filter has worked for years, it got broken with the latest update.
@philm: do you know of any changes in the KDE libs dealing with GPG?