Possible Bug with more than one SchemaLocation

Hi, with my students i try to separate definition of types in our namespace ( AlumneTipus) from the general definition of alumno.

Im following this: http://www.java2s.com/Tutorial/XML/0060__XML-Schema/Onexmldocumentwithtwoxmlschemas.htm

But it gives me error:

XmlFile:

<alumnat xmlns="http://www.example.org/Alumne" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.example.org/AlumneTipus alumnetipus.xsd 
                        http://www.example.org/Alumne alumneschema.xsd">
    <alumno>
        <nombre>aaaaa</nombre>
        <apellidos>Delos Palotes</apellidos>
        <direccion>Cuatro esquinas</direccion>
        <codigopostal>30190</codigopostal>
    </alumno>
</alumnat>`

XSD "General" File:

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
    targetNamespace="http://www.example.org/Alumne"
    xmlns="http://www.example.org/Alumne" 
    xmlns:MeusTipus="http://www.example.org/AlumneTipus" 
    elementFormDefault="qualified">
    
    <xs:element name='alumnat'>
        <xs:complexType>
            <xs:sequence>
                <xs:element name='alumno' minOccurs='0' maxOccurs='unbounded'>
                    <xs:complexType>
                        <xs:sequence>
                            <xs:element name='nombre' minOccurs='1' maxOccurs='1' type="MeusTipus:tnomstring" />
                            <xs:element name='apellidos' minOccurs='1' maxOccurs='1'
                                type="xs:string" />
                            <xs:element name='direccion' minOccurs='1' maxOccurs='1'
                                type="xs:string" />
                            <xs:element name='codigopostal' minOccurs='1' maxOccurs='1'
                                type="xs:string" />
                        </xs:sequence>
                    </xs:complexType>
                </xs:element>
            </xs:sequence>
        </xs:complexType>
    </xs:element>

</xs:schema>`

XSD "With definition of tipus" File:

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
    xmlns="http://www.example.org/AlumneTipus" 
    targetNamespace="http://www.example.org/AlumneTipus"
    elementFormDefault="qualified">
    
    <xs:simpleType name="tnomstring">
        <xs:restriction base="xs:string">
            <xs:pattern value="[a-zA-Z]{5}"/>
        </xs:restriction>
   </xs:simpleType>

 
</xs:schema>`

So vscode give me these errors:

[{
	"resource": "/home/eduardo/Descargas/alumne.xml",
	"owner": "_generated_diagnostic_collection_name_#0",
	"severity": 8,
	"message": "There are '2' errors in 'alumneschema.xsd'.",
	"source": "xml",
	"startLineNumber": 12,
	"startColumn": 55,
	"endLineNumber": 12,
	"endColumn": 71,
	"relatedInformation": [
		{
			"startLineNumber": 21,
			"startColumn": 88,
			"endLineNumber": 21,
			"endColumn": 110,
			"message": "src-resolve.4.2: Error resolving component 'MeusTipus:tnomstring'. It was detected that 'MeusTipus:tnomstring' is in namespace 'http://www.example.org/AlumneTipus', but components from this namespace are not referenceable from schema document 'file:///home/eduardo/Descargas/alumneschema.xsd'. If this is the incorrect namespace, perhaps the prefix of 'MeusTipus:tnomstring' needs to be changed. If this is the correct namespace, then an appropriate 'import' tag should be added to 'file:///home/eduardo/Descargas/alumneschema.xsd'.",
			"resource": "/home/eduardo/Descargas/alumneschema.xsd"
		},
		{
			"startLineNumber": 21,
			"startColumn": 88,
			"endLineNumber": 21,
			"endColumn": 110,
			"message": "src-resolve: Cannot resolve the name 'MeusTipus:tnomstring' to a(n) 'type definition' component.",
			"resource": "/home/eduardo/Descargas/alumneschema.xsd"
		}
	]
}]

[{
	"resource": "/home/eduardo/Descargas/alumneschema.xsd",
	"owner": "_generated_diagnostic_collection_name_#0",
	"code": "src-resolve.4.2",
	"severity": 8,
	"message": "src-resolve.4.2: Error resolving component 'MeusTipus:tnomstring'. It was detected that 'MeusTipus:tnomstring' is in namespace 'http://www.example.org/AlumneTipus', but components from this namespace are not referenceable from schema document 'file:///home/eduardo/Descargas/alumneschema.xsd'. If this is the incorrect namespace, perhaps the prefix of 'MeusTipus:tnomstring' needs to be changed. If this is the correct namespace, then an appropriate 'import' tag should be added to 'file:///home/eduardo/Descargas/alumneschema.xsd'.",
	"source": "xsd",
	"startLineNumber": 21,
	"startColumn": 88,
	"endLineNumber": 21,
	"endColumn": 110
},{
	"resource": "/home/eduardo/Descargas/alumneschema.xsd",
	"owner": "_generated_diagnostic_collection_name_#0",
	"code": "src-resolve",
	"severity": 8,
	"message": "src-resolve: Cannot resolve the name 'MeusTipus:tnomstring' to a(n) 'type definition' component.",
	"source": "xsd",
	"startLineNumber": 21,
	"startColumn": 88,
	"endLineNumber": 21,
	"endColumn": 110
}]

I attach the files, any help would be apreciated.
As said id like to create a namespace http://www.example.org/AlumneTipus in file alumnetipus.xsd with the definition of the different types that we are going to configure.
In alumneschema.xsd in namespace http://www.example.org/Alumne the general definition of the schema.

alumne.zip

Start by reproducing the diagnostics in VS Code with the attached XML, alumneschema.xsd, and alumnetipus.xsd files. Inspect how the XML extension resolves the cross-namespace schema reference, and determine whether the reported error is caused by the extension or by the schema setup. Done means the expected validation behavior is documented or the reproducible extension defect is fixed.