nsd-3 constraint in https://hl7.org/fhir/R5/namingsystem.html#invs starts with

uniqueId.where(authoritative = 'true')

'true' is a string literal and NamingSystem.uniqueId. authoritative property is boolean. Thus the comparison

authoritative = 'true'

is always evaluated to false as a boolean can't be implicitly converted to a string and vice versa(see https://hl7.org/fhirpath/N1/#conversion boolean <-> string requires an explicit conversion).

To fix the nsd-3 expression 'true' needs to be replaced with true (without single quotes). So the final expression will look like

uniqueId.where(authoritative = true).select(type.toString() & period.start.toString() & period.end.toString()).isDistinct()