Collections not working

I've been an Avenza user since the old PDF Maps days, and currently use Avenza Maps (free consumer edition) on two iOS devices: an iPhone SE2 and an iPad Mini 6.  Haven't used the apps on either in a few months, so there have been a few app updates since my last use.  I have the latest version (4.2.1) installed on each device, and in preps for some backcountry stuff tomorrow I fired the app up on each.  It appeared that all my downloaded/purchased maps were no longer stored on either device, but on both of them for each map there was an error message that downloading had errored out.

So I signed out on each device, then signed back in.  That seemed to un-glitch the issue, and all my maps started downloading.  Problem is that all of my maps that are part of collections no longer operate as collections...they operate as if they are simply part of a folder of other maps...none of the maps that are part of the same collections show on the mini maps, and I have no ability to scroll from one map to another in any of my collections.

I even went so far as to completely delete the app off of one of my devices and then do a fresh install.  That worked, and my library was empty, so I signed in, went to my account's download history, and then re-downloaded a simple two-page map set that I'd prior purchased.  It downloaded just fine to the app's root directory, and came in as a collection by default, but again, the two map set is not working as a collection.  I even tried converting from a set to a folder, then back to a collection again, but no dice.

I've been surprised that I haven't been able to find any mention of this here on the Community pages nor have I seen any mentions of the issue I'm having in recent app reviews.  I'm not doing anything different than I even have before, so I'm quite confident I'm doing everything correctly.

Can anybody offer any help, or even just confirm that they are experiencing the same issue?

Thanks!