Keep the whole page live when the slices fail before answering

A slice watch that failed to start closed the group while the page kept
ignoring the whole-page watch, so later edits never showed. Until the
slices first answer, a failure hands the page back to the whole-page
watch, and the next change tries the slices again.
b10f193c98Dara Adedeji committed on 10/21/2026, 11:45:55 PMparentf5048c8

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