Misplaced diagnostic for cvc-elt.3.1

[fbricon]

Given this wrong schema:

<?xml version="1.0"?>
<xs:schema elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>
    <xs:complexType name="property" xsi:nil="true">
    </xs:complexType>
</xs:schema>

the closing bracket after xsi:nil="true" is underlined in red:

See the diagnostic data:

{
	"resource": "/Users/fbricon/Downloads/sample-resources 5/foo.xsd",
	"owner": "_generated_diagnostic_collection_name_#0",
	"code": "cvc-elt.3.1",
	"severity": 8,
	"message": "cvc-elt.3.1: Attribute 'http://www.w3.org/2001/XMLSchema-instance,nil' must not appear on element 'xs:complexType', because the {nillable} property of 'xs:complexType' is false.",
	"source": "xml",
	"startLineNumber": 5,
	"startColumn": 52,
	"endLineNumber": 5,
	"endColumn": 52
}

[angelozerr]

Fixed with test too