How get views advanced dynamic URL contextual filter to work with full taxonomy path?
You must use 2 contextual filters

First one is: Contextual filter: Content: Has taxonomy term ID depth modifier

Second one is: Contextual filter: Content: Has taxonomy term ID depth modifier with the same criteria you did.

I put the view path to be the vocabulary name and tested contextual filters like:
//Hierarichay
      tag1
        tag2
        tag2

//Urls
    tag1/tag2
    tag1/tag3

The views gets results for the child tags every time {2, 3}.
If you didn't use the first filter it will consider the parent as argument.
Hope it solve your problem.