API Annotations: AnnAt disconnected for TYPEAPP

For the code

type family F1 (a :: k) (f :: k -> Type) :: Type where
  F1 @Peano a f = T @Peano f a

the API annotation for the first @ is not attached to a SourcSpan in the ParsedSource

Trac metadata

Trac field	Value
Version	8.6.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (Parser)
Test case
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