[Validation / view models / page lifecycle series] Can't make ModelState server validation work when it happens in async method in parent VM of VM that posts back to server

[MarianV]

Then it will be correct to catch it, log it and not set context.IsCommandExceptionHandled / context.IsPageExceptionHandled.

[MarianV]

So, clunky but it does the job:

I can finally use properties safely for parent VM references in children.