There are actually three different things: replays, reloading a message, and delayed messages. Replays are impossible in the signal protocol, so that’s not what

There are actually three different things: replays, reloading a message, and delayed messages. Replays are impossible in the signal protocol, so that’s not what happened. Delayed messages is part of signal: you can receive message2 before message1. Reloaded message is probably what happened, it doesnt work at the signal level since “deleting a message” is not something signal specifies.