Welcome! This forum has a treasure trove of great info – Scouters helping Scouters! Just a heads up, though - all content, information, and opinions shared on this forum are those of the author, not the BSA.
It appears to manifest around the time that rechartering occurred for the various units that have reported it, but that’s still anecdotal.
I would suggest contacting scoutbook.support@scouting.org with information that your unit is suffering the same problems that many/most of the rest of us are.