Created attachment 1060 [details]
Build #2686 mounted first followed by 4.14.0.
If one mounts multiple macOS ISO client installers simultaneously, with inherently different installer backgrounds such as 4.14.0 and #1234, then the backgrounds for both of these installers will correspond to the one mounted first; the theory is that the background image is hard-coded accordingly.
Seen on macOS 12.5.1 with clients 4.14.0 and build #2686.
Created attachment 1061 [details]
4.14.0 mounted first followed by build #2686.
In comment 0, the reference to build #1234 was supposed to be #2686, as stated towards the end.