Messages you typed ahead come back
If a run stops or fails before it reads a message you typed while it was working, that text now returns to the composer instead of vanishing.
While the agent is working you can type your next message ahead of time, and it is delivered when the agent is ready for it. If the run stopped or hit an error before it got there, that waiting text used to disappear, and it could even resurface later in an unrelated run.
Now it comes straight back to the composer, newest on top, so you can send it again or edit it first. A note from a sub-session is never mistaken for something you typed, so only your own words return.