Installing Sonoma 14.1.2 fails

I have an installer downloaded from the App Store a few weeks ago for macOS Sonoma 14.1.2 (I've made copies for testing purposes), but today I have been unable to install it on a volume - an experiment I had been conducting repeatedly last week.

Is Apple blocking 14.1.2 from being installed now? (Sonoma 14.2 is the version currently available from the App Store)

Have I reached some kind of limit on the number of times I can install it?

Any other ideas?

Here is the alert:

Note: the problem I am testing is an issue with an app installed from TestFlight (that contained a network system extension) that killed networking when the OS was updated from Sonoma 14.1.2 to Sonoma 14.2. (related post)