Under the hood
Background progress status lines are now told not to answer the user's question early
What
The internal prompt used to generate the short one-line status shown while background work is in progress now explicitly forbids it from stating a verdict or an answer to the user's question. It's required to only describe progress, leaving the actual answer for the agent's final reply.
Why
This stops the progress line from prematurely announcing a conclusion before the work is actually finished, which could otherwise be misleading if the real answer ends up different once the task completes.