@lunareclipse
I should note there are not any known vulnerabilities in the old version implemented by clients, but there are still things that aren't great, like unencrypted reactions and metadata (this message edits that message id, or is a reply to that message id. the contents are still encrypted)
The invisible salamander problem may be possible, not sure, but being able to send messages that decrypt to different things is also possible by any server admin in a group chat, because the server can send different ciphertexts to different people. At least as far as I can tell.