These GEOID_NOT_AVAILABLE errors were my fault, and I fixed them in "[PATCH v3 5/7]". I made a really dumb mistake before :D
Apologies (once again) for this mess. I've re-tested the patches on my machine and it should be working now.
From Marvin, the TestBot: kernel32: locale.c:4908: Test failed: GEOCLASS_REGION: should never return GEOID_NOT_AVAILABLE in this platform.