AzulNanshan 18A23950 is an iOS 14.1 NonUI build for the iPhone 12 Pro, it was mentioned in Smokey tests from DawnAni 21A92521w and is either the result of a radar or what resulted in a radar being filed.
"-- rdar://74783236 (D53 SOC-Burnin CB(0x31) can not be writed pass with the new bundle AzulNanshan18A23950l)"