Yukon 17A508

Basic Info
Yukon 17A508 is an InternalUI build of iOS 13, judging by the kernel version, it was compiled a day before WWDC 2019. It is a full build.

Findings
This build references to an accessory called "B389", this is the codename for AirTags. It also refrences "D79" which is the codename of the iPhone SE 2020 model.