Group attributes not searchable under Users --> Groups view

Hello, 

We're running IG&L 7.2.0.177042 P01 

I came across an annoying bug where searches performed on a Group page (Users --> Groups) aren't searching the Group Backup owner field. 

Below you can see that search term "annina" gives me 8 groups where they are listed as owner, but result set is missing 3 groups seen in the second screenshot where "annina" is the group backup owner. 

Screenshot 1:

Screenshot 2:

Does anyone know why Aveksa would search just owner field and not group backup owner in the first screenshot? Same issue exists on previous versions as well, so I am curious to hear your thoughts on if this is "working as expected" or am I missing something? 

Here's how attributes are configured:

Thanks,

Prateek