I solved this problem, or shall I say I identified the source of it. I have a Gmail add-on in Chrome called Gmelius, and by process of elimination I saw that this issue self corrected when Gmelius was disabled, or when I viewed Gmail in Firefox. I wrote to the Gmelius support team who ultimately said they were going to forward the issue to their development team. Apparently “Pending” is one of their reserved words (though that must be recent, as I have used Gmelius along with my Pending label for years).
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