Sun Jul 22 2018 16:45:42 UTC
I'll just put this with the rest of the fire.
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ID Product Comp Assignee Status Resolution Summary Changed
39636 Forms Forms bugzilla VERI FIXE Cannot use XamlC with OnPlatform in resources, it throws System.InvalidCastException Mon 20:37
2 bugs found.

as

File a new bug in the "Forms" product