Didn't show up full list If i filtered parent category

[byrage]

Hi. I am using Redmine 3.2.3.stable.
I installed redmine_category_tree plugin and I maked 'parent', 'child' categories, and maked test issues in these categories.
then, went Issues menu and filtered parent category. but only show containing parent category.
is this bug? or not feature in this version?

sorry for my poor english. then I attach some screenshot. Thanks!

full issues list

parent category issues list

child category issues list