Report unsupported on using underscored type argument if the corresponding feature is disabled

compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/tower/PSICallResolver.kt

@@ -691,7 +691,7 @@ class PSICallResolver(
 
             val typeReference = projection.typeReference ?: return@map TypeArgumentPlaceholder
 
-            if (typeReference.isPlaceholder && arePartiallySpecifiedTypeArgumentsEnabled) {
+            if (typeReference.isPlaceholder) {
                 val resolvedAnnotations = typeResolver.resolveTypeAnnotations(context.trace, context.scope, typeReference)
                     .apply(ForceResolveUtil::forceResolveAllContents)
 
@@ -700,6 +700,10 @@ class PSICallResolver(
                     context.trace.report(Errors.UNSUPPORTED.on(annotationElement, "annotations on an underscored type argument"))
                 }
 
+                if (!arePartiallySpecifiedTypeArgumentsEnabled) {
+                    context.trace.report(Errors.UNSUPPORTED.on(typeReference, "underscored type argument"))
+                }
+
                 return@map TypeArgumentPlaceholder
             }