Describe the Bug
Kleopatra generates OpenPGP keys with the unofficial AEAD Encrypted Data packet (type 20). BouncyCastle fails to recognize this key packet and throws an exception whenever such key is encountered.
An issue to this exists but has been ignored for years: #497
This has also been reported to StackOverflow since 2022 and has not yet been fixed.
Developers using Java do not face this issue as noted in the StackOverflow post, though I've not verified this.