NPE in TupleMappingModelExpressible constructor with Converter

Description

Queries with tuples composed of attributes coming from subqueries utilizing converters, such as:

SELECT s FROM MyEntity AS s
WHERE (s.id, s.creationTime) IN 
    (SELECT t.id, max(t.creationTime) FROM MyEntity AS t 
        WHERE t.endTime >= :start AND t.startTime <= :end 
        AND t.ready = true GROUP BY id)

where startTime and endTime and the query parameters are of a non-standard type that uses a converter. Neither an autoApply converter nor explicit @Convert converter work.