Select operator on computed properties doesn't go through the DTO defined getter

When running an OData $select operator on a property which has a custom getter which concats data from several properties, the wrong value is returned.

An example of a failure reproduced locally:

Calling the API GET machinese with a select operator to return only machineTags:
localhost:1059/api/machines?$filter=id eq '0002aabb5a73e0648fc1f97448e033f3fd2dd25e'&$select=machineTags
This action returns no machine tags.

However, when requesting for the specific machine or all machines without the select operator - there are tags showing.
This tags are part of another property which is appended to the machine tags in the DTO getter method for MachineTags

Class definitions.

Table("Machines")]
public class MachineDbEntity
{
...
        public List<TagsDbEntity> Tags{ get; set; }

        public string MachineGroup { get; set; }
...
}

public class MachineDto
{
...
        private List<string> m_machineTags;

        public List<string> MachineTags
        {
            get
            {
                if (OnPremTag != null && !m_machineTags.Any(tag => tag.Equals(OnPremTag, StringComparison.OrdinalIgnoreCase)))
                {
                    m_machineTags.Add(OnPremTag);
                }

                return m_machineTags;
            }

            set => m_machineTags = value;
        }

        public string OnPremTag { get; set; }
...
}

Query used:

return machineDbEntities.Select(machine => new MachineDto
    {
        ...
        MachineTags = machine.Tags.Select(tag => tag.TagName).Where(t => t != null).ToList()
        OnPremTag = machine.MachineGroup
        ...
    };

What I've tried testing and did not work:

• Adding the OnPremTag to the select operator
• Changing the MachineTags property to IEnumerable
• Changing getter/setter login in MachineDto

FYI - @habbes