OData4 translator: disappearing negation when using 'in' predicate

Suppose this query against an OData4-backed view:

SELECT intkey FROM bqt1.smalla WHERE NOT (intkey IN (1, 2, 3))

This is translated to a filter:

filter=intkey eq 1 or intkey eq 2 or intkey eq 3

The NOT operator disappeared and this will return rows where intkey is equal to 1, 2 or 3.