Crash when attempting to restore a page route that had it's pageData type changed from nullable to non-nullable

[Moncader]

Description

When StandardPage page data's type changes from nullable to non-nullable and null data is trying to be restored on route load, a type error occurs and the route fails to load.

Reproduction Steps

• Create a StandardPage that has some kind of nullable (including void) pageData type
• Load that page once to get it in to the restoration cache.
• Change the type of that StandardPage to something that is non-nullable
• Load that page again and observe the crash.

Environment

• All