A test like "argument name error: misnamed argument" (test/features/v1/mswOrchestrateTest.js) will fail if the composition is Z881 instead of Z882. This means that we are inappropriately skipping normal function execution in cases where the builtin list is not part of the function call's internals (possibly because doValidate=false was set too aggressively somewhere).
A good test for this fix would be to replicate the "misnamed argument" test but using Z881, not Z882, in the composition.