App Intents "Text" parameters seem broken in iOS 17.6 beta

I'm getting widespread reports from users trialling iOS 17.6 public beta that Siri Shortcuts are failing whenever they enter any text that looks like a URL.

It's getting reported to me because my app happens to have an app intent with a string parameter which can contain a URL in some circumstances.

However it's easily reproducible outside of my app: just create a 2 line shortcut like the one below. If you change "This is some text" to "https://www.apple.com" the shortcut below will fail:

In iOS 17.5 entering "https://www.apple.com" works fine.

I've raised feedback on this (FB14206088) but can anyone confirm that this is indeed a bug and not some weird new feature of Shortcuts where the contents of a variable can somehow change the type of a variable?

It would be very, very bad if this were so.

Shortcuts involving Text URLs are equally broken in iOS 17.6 beta 3, although the error message has changed:

App Intents "Text" parameters seem broken in iOS 17.6 beta
 
 
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