Is the get children node in control rig works correctly?

Hello. I’m trying to use get children node in my rig blueprint and for that hierarchy and parameters
image
image
I’m getting this result:


As you can see, I’m getting all the child bones with _L suffix and bones from another part of hierarchy with _R suffix. Why is this happening? Is this a bug? I’m using UE5.1
Full hierarchy:
image
Edit:
Additional info:
I’m using this logic

and when I’m changing “Old” parameter in “replace items” node to “_R” everything works fine. But it doesn’t have any sence for me…