Unclear It is not clear what condition switches this behaviour on, so it may not apply to every user.
What
Compaction is when Claude Code shortens a long conversation by summarizing older parts so it fits in the model's memory. While it runs, Claude Code shows progress, such as a spinner.
Under a certain internal condition, Claude Code now holds back the "compaction ended" progress signal instead of acting on it straight away. It acts on that held signal when the next event arrives, unless that next event is a successful compaction result.
Why
This changes how the progress indicator behaves around compaction. The likely effect is that the spinner stays up until compaction has really finished, instead of disappearing early.
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It is not clear what condition switches this behaviour on, so it may not apply to every user.