SetValue is not invoked in a Dapper custom TypeHandler

As per THIS question:

Given:

public class GuidHandler : SqlMapper.TypeHandler<Guid>
{
    public override void SetValue(IDbDataParameter parameter, Guid value)
    {
        // My Custom logic
    }

    public override Guid Parse(object value)
    {
        return Guid.Parse(value.ToString());
    }
}
...
SqlMapper.AddTypeHandler(new GuidHandler());

Even though the Parse is correctly invoked when reading from the DB, the SetValue however never gets called when writing the data.

Any idea of what is going on?

Start with the GuidHandler and SqlMapper.AddTypeHandler registration shown in the issue, then trace how Dapper handles the type when writing parameters versus reading values. Confirm the expected behavior for a Guid write and identify whether SetValue is reached; done means the custom SetValue logic is invoked during writes without breaking Parse on reads.