It might be crashing somewhere inside provide[Type]OptionsCollection(for: with:) or the completionHandler isn't called.
You can debug your intent by running your intent scheme. Xcode will prompt you for an application, select yours and then go back to the home screen to edit your widget. Putting a breakpoint in that function should at least point you in the right direction.
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It's probably crashing somewhere inside provide[Type]OptionsCollection(for: with:) and keeps spinning because the completionHandler isn't called.
I had a similar issue when I forgot to add the App Group capability to the Intent target so I could access the CoreData store. You can debug your intent by running your intent scheme. Xcode will prompt you for an application, select yours and then go back to the home screen to edit your widget. That should at least point you in the right direction.