This here is resolved, for timegrids findings see other ticket, the issue is not related to the one from this ticket and no regression, as it turned out.

Test with beta32

And when I switch of read-as-plain, both testmails in the inbox are displayed as expected but one of the ones from the sent-folder has an empty body:

with 3.3.90.29-Beta:

Right, it's the same with gpgol disabled. I set it to invalid.

But you are able to do this w/o gpgol being active?

That's not surprising. The fix was made after GpgOL 2.6.7. And gpg4win-5.0.0-beta395 still seems to include GpgOL 2.6.6 only.

Looks good to me on gpg4win-5.0.0-beta395 @ win11

Issue is still present in gpg4win-5.0.0-beta395 @ win11:

gpgol logs:

Maybe related to https://dev.gnupg.org/T7813

Looks good to me on gpg4win-5.0.0-beta395 @ win11

Looks good to me on gpg4win-5.0.0-beta395 @ win11

Looks good to me on gpg4win-5.0.0-beta395 @ win11

Looks good to me on gpg4win-5.0.0-beta395 @ win11

Might there be a relation to T7842? But I would have thought that then all signed messages would be unaffected.

that's probably at least partly another issue: https://dev.gnupg.org/T7843

additionally, the body of the messages is (in most cases) not shown any more.

With the beta-25 the body of the mail is not saved back to the server any more but the security level tags are. So the test mail still seems to be a signed and decrypted empty mail even if you deactivate gpgol.

We did decrypt the mail successfully and called put_oom_string to update the Body successfully, but for some reason for new mails the put calls succeed but the displayed Text is not updated i.e. no "OpenGPG Message Please wait..." or decrypted message.
When closing the mail window the mail is still open in the preview pane and we should get back the mail content (Body), but we don't get back what we set with the put call but what is displayed i.e nothing (empty string).
So we pass on the close call which does write back our put value. (Plaintext leak)

Happens on vsd 3.3.2, too.

At which point did were you asked for the passphrase for decryption? You flushed the gpg-agent cache, right?

This happens in pgp signed unencrypted text mails, too.

with VS-Desktop-3.3.90.19-Beta, and settings disableAutoPreview and ReadAsPlain

with VS-Desktop-3.3.90.19-Beta, and settings disableAutoPreview and ReadAsPlain