This issue seems to repro starting with Zui and Zui Insiders builds created some time starting around November 3, 2023.

I first reported the symptom in detail at #2866 (comment) while I was testing a Dev build based on that branch. However, I've since confirmed that recent Zui Insiders releases starting with 1.3.2-9 all exhibit the same symptom. I also went back and dug up the Dev Build from this Actions run based on commit acb5267 and confirmed it works fine as I remembered it, then just now made another Dev Build in another Actions run also based on commit acb5267 and found that one fails with the symptom. So the problem seems to follow "when the build was made" and not "our code that went into the build".

Conclusion: Based on all this, I have to suspect that maybe there's some dependency for which we're pointing at "the latest" and that dependency has advanced to something that breaks us. I have no idea what that might be though!