Syntax Highlighting in fsi files broken by unparenthesized tuples

In fsi files, the F# compiler allows declarations like these:

val pair : 'a -> 'b -> 'a * 'b
val fst : 'a * 'b -> 'a

However, in Ionide VSCode, such declarations mess up the syntax highlighting for ensuing lines (see Broken.fsi in attached project). The highlighting can be fixed by enclosing tuple types in parentheses (as in Fixed.fsi), but it would be nice if the highlighting handled the unparenthesized cases.
SynHighlightExamples.zip