K2: don't count use-sites of Java type parameter with nullable bounds as not null

core/descriptors.jvm/src/org/jetbrains/kotlin/load/java/typeEnhancement/signatureEnhancement.kt

@@ -278,4 +278,12 @@ private class SignatureParts(
 
     override val TypeParameterMarker.isFromJava: Boolean
         get() = this is LazyJavaTypeParameterDescriptor
+
+    override fun getDefaultNullability(
+        referencedParameterBoundsNullability: NullabilityQualifierWithMigrationStatus?,
+        defaultTypeQualifiers: JavaDefaultQualifiers?
+    ): NullabilityQualifierWithMigrationStatus? {
+        return referencedParameterBoundsNullability?.copy(qualifier = NullabilityQualifier.NOT_NULL)
+            ?: defaultTypeQualifiers?.nullabilityQualifier
+    }
 }