Unclear It is not known when the option that turns on the second summary is set.
What
Compaction shortens a long conversation by replacing older parts with a summary, while keeping the most recent exchanges as they were. When an option for this is set, a successful compaction can now send a second request that summarizes the first summary together with those kept exchanges. If the second request fails, the first result is kept.
The point where the conversation is split is also chosen differently, based on the last message that has results.
Why
This changes how much of a conversation survives compaction and in what form.
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The writer flagged doubt
It is not known when the option that turns on the second summary is set.