FIX: errors that're triggering by too long excerpts (PR #13056)

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The title of this pull request changed from “FIX: errors triggered with too long excerpts” to "FIX: errors that’s triggering with too long excerpts

The title of this pull request changed from “FIX: errors that’s triggering with too long excerpts” to "FIX: errors that’re triggering by too long excerpts

I am approving this @AndrewPrigorshnev but I recommend deploying a few multisite clusters when this change is made to confirm there are no weird contention issues. I don’t expect there to be, but have been proven wrong in the past.