I've been running some plugins from the Windows release of
https://github.com/DISTRHO/PawPaw and they've all been working quite well but some versions ago (I'm honestly not sure when. Maybe a few versions before or on 7.19) certain plugins stopped being able to run and now have a different naming scheme.
They don't actually give errors about failing to scan and I know none of these accept MIDI input of any kind.
I'm running Windows 11 64 bit, REAPER 7.19 though I've also tried the most recent release candidates.