Thanks for the suggestion; I tried, but no luck.
ue5-main and 5.0 produce the same error. I’ve deleted and re-cloned both repositories twice, and have even purged and reinstalled VC2022 just in case.
The generation script is clearly looking for a Restricted folder under …\Engine\ that is not being provided by the repo or the UE5-Prerequisites…
I suppose I’ll just have to wait this out and see if a future commit fixes it.