You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
Bash ToolArea: what it touches
ImprovementsKind: in v2.1.227,
ImprovementsSection of the release
What
The message you get when a Bash command is backgrounded is now built in one place, with different wording depending on whether you asked for it, whether it hit the timeout, or whether it will be killed when Claude finishes its reply.
Details
The last case warns explicitly that the process is terminated at the final response, so no completion notice can arrive after that.
Evidence
If it exits while you are still working you will be notified, but it is terminated when you give your final response and no notification can follow that
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
