There’s nothing wrong with GPG/PGP.
There is no “bug”. Don’t listen to EFF. Don’t disable GPG. Disable image loading instead (and probably HTML).
This is a bug in email readers. Not GPG.
Your email client might call it different things. Apple Mail calls it “remote content”. Keep that disabled always.
An additional safeguard is using POP instead of IMAP to remove messages from the server. You’ll lose syncing though.