Simple answer is because build 22000.1 was never
flighted to Insiders. We got 22000.51.
Just to correct you, the ISO created from the distribution folder is 22000.1, as was the install. The installation on my notebook was 22000.51 the next day
I edited my comment to clarify.
Insiders getting Windows 11 got build 22000.51
using W.U., not creating an ISO.
CK, I think you misunderstood me. Downloaded via W.U. and created the ISO before rebooting. So the resulting installation was through W.U