Microsoft.XmlSerializer.Generator hangs

Start by building the simple library project with Microsoft.XmlSerializer.Generator enabled, using the provided MeasureListType reproduction and its XML text surrogate. Compare behavior with the generator disabled and vary the number of surrogate properties or IXmlSerializable implementations. Done means compilation no longer hangs and the generated serializer does not throw at runtime when the concerned properties are absent from the raw XML.

Description

First of all, the classes generated for https://aixm.aero/document/aixm-51-xml-schema-xsd are not fully supported. For example, array of doubles in XML text content, e.g. <doubleList>123.45 678.9 12.3 4.5</doubleList>.

[XmlText]
public double[] Text { get; set; }

The above throws an InvalidOperationException at runtime. So I use a surrogate as follow.

 [XmlText]
+[JsonIgnore]
+public string TextAsString {
+  get => string.Join(' ', Text.Select(d => d.ToString()));
+  set => Text = value.Split(' ').Select(double.Parse).ToArray();
+}
+[XmlIgnore]
 public double[] Text { get; set; }

(It works without using the source generator.)
Then, Microsoft.XmlSerializer.Generator hangs at compile-time when I apply this workaround to more than 2 such properties. It also hangs if I implement IXmlSerializable on the classes instead of applying the surrogates. The CPU fan keeps spinning, so it is not a dead lock, but potential infinite loop?
Ideally, it should support deserializing numeric arrays encoded in XML text content.

Reproduction Steps

[System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "4.8.3928.0")]
[System.SerializableAttribute()]
[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Xml.Serialization.XmlTypeAttribute(Namespace="http://www.opengis.net/gml/3.2")]
[System.Xml.Serialization.XmlRootAttribute("valueList", Namespace="http://www.opengis.net/gml/3.2", IsNullable=false)]
public partial class MeasureListType {
        
    private string uomField;
        
    private double[] textField;
        
    /// <remarks/>
    [System.Xml.Serialization.XmlAttributeAttribute()]
    public string uom {
        get {
            return this.uomField;
        }
        set {
            this.uomField = value;
        }
    }
        
    /// <remarks/>
    [System.Xml.Serialization.XmlTextAttribute()]
    [JsonIgnore]
    public string TextAsString
    {
        get => string.Join(' ', Text);
        set => Text = value.Split(' ').Select(s => double.Parse(s)).ToArray();
    }

    [XmlIgnore]
    public double[] Text {
        get {
            return this.textField;
        }
        set {
            this.textField = value;
        }
    }
}

Build a simple library project with the tool enabled.

Expected behavior

It should generate a serializer that at least won't throw during run-time when the properties concerned do not appear in the raw XML.

Actual behavior

The source generator hangs during compile-time.

Regression?

No response

Known Workarounds

Disable the XML serializer generator tool.

Configuration

• .NET 8
• Windows 11 22631.3085
• x64
• not specific to the configuration
• not specific to any browser

Other information

No response