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The GitHub CSS changed recently I guess and it broke the selector used to find the checks.
The following diff solves the issue:
$ diff /tmp/broken /tmp/fixed 60c60 < var actionRuns = jQuery(".merge-status-item > .merge-status-icon > .color-text-success.octicon-check"); --- > var actionRuns = jQuery(".merge-status-item > .merge-status-icon > .color-fg-success.octicon-check");