Udt property parameter in a popup

Ignition 7.6.5-rc2
I pass an udt parameter to a popup.
I try to access tag properties “EngUnit” with the following expresion but it doesn’t retrun any value ???
In a template such of expression is ok.
Do I miss something ???

[attachment=1]bug_popup.png[/attachment]

With indirect tag, no value returned ?

[attachment=0]bug_indirect.png[/attachment]