Task Validation fails in 5.2.0, works in 5.1.0

[hhund]

Validation of Task resource against profile defining multiple input slices discriminated by custom CodeSystem values fails in 5.2.0 but works in 5.1.0.

If this is a bug, I suspect it's somewhere starting from HAPI 5.2.0: org.hl7.fhir.validation.instance.InstanceValidator L4158
The corresponding code in HAPI 5.1.0: org.hl7.fhir.validation.instance.InstanceValidator L3905 seems to work.

To Reproduce
See JUnit test in PR #2284. StructureDefinition, CodeSystem, ValueSet and Task Resource needed to reproduce this issue are created in the JUnit test.

Environment (please complete the following information):

• HAPI FHIR Version 5.2.0