We've been on 2022 Q3 64-bit for Windows and RT applications for a little over a year. Both the RT and Windows builds fail, but RT way more frequently. I try tracking down the offending VI, I try renaming classes back and forth, I've tried checkbox roulette in the build settings, and I've tried changing the private class data. The only thing that consistently works, is clearing the compile cache over and over until it builds. Then usually running from source fails to deploy and I clear it over and over until that works, which usually breaks the build again. My failure mode is different in that I don't see it hanging on initializing build.
All that being said I'm glad to leave 32 bit behind.