Is BoundSecurityProperties broke?

I've worked with BoundAttachments and assume BoundSecurityProperties should work the same but when I try to access them I get null references.

For example when I look at 'Count' it shows the property I've defined exists but when I try to reference it by name or number I get 'Nothing'.


?MyColumn.BoundSecurityProperties.Count
1&

?MyColumn.BoundSecurityProperties.Item(1)
[Object@Nothing]

When I do exactly the same thing with an attachment it works as expected.

?MyEntity.BoundAttachments.Count
1&

?MyEntity.BoundAttachments.Item(1)
[IBoundAttachment@0x118700b0]