The other day Mike Peterson noted that The Flying McCoys panel was in rerun status.
That has led me to speculate on the possible cause.
A year ago Glenn McCoy returned to the funny pages after a Hollywood sojourn. Then last month Glenn “abandoned” The Duplex, his last daily being March 18, 2023. That was followed by an announcement:

Glenn has returned to animation (for the moment the project remains a mystery). Brother Gary McCoy took back The Duplex with the April 20, 2023 daily installment and yesterday Gary returned to the Sunday page.

Speculation: When Gary once again took over cartooning The Duplex from Glenn he needed a little time to get both it and his The Flying McCoys, for which he had been flying solo for years, on schedule so The Flying McCoys went rerun for a week. Though why it was The Flying McCoys and not The Duplex that went rerun I haven’t an answer to in my made-up reasoning.
Of course it could be the McCoys enjoying their annual week-long green beer drinking celebration of St. Pat’s Day.
But let’s note that The Flying McCoys returned to first run today.