Non-stealth finishers on Tusk enemies do not count toward finisher kill Riven challenge

[Lone_Wolfen]

As per the title suggests, my attempts to do a Riven challenge requiring an amount of finisher kills in a single day while doing a Plains bounty was interrupted when I had found that non-stealth finishers on Tusk Grineer did not count in the Riven challenge.  I was able to return in a solo free roam and found that stealth finishers still counted on Tusk.  I was using Ivara sleep arrow to open up finisher kills but other abilities that open to finisher also likely will not help on Tusks.