Patches gone in Reaper

I don't know what happened, but suddenly all my Reaper tracks that used Komplete Kontrol have lost their Patch information! It still shows the right instrument, but the box shows a question mark instead of icon for the patch.
I believe it started after a normal update on the Native Access portal.
I tried opening the stand-alone app, rescanning all the plug-ins and files, unchecking the "Always Use Latest Version of NI Plug-ins" box, then rescanning in Reaper.
If I choose a new patch and save, when I re-open the file it keeps the right patch. So it works as expected with new changes.
But now I have a few dozen songs that have lost their patch information. Major bummer.
Any thoughts on what might be happening? Thanks in advance!
Notes:
Reaper 6.73. Komplete Kontrol 2.8.1. Windows 11, Asus G15. Komplete Ultimate 13.
All software, drivers up to date.
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