Tried SLKR vs SLKR and both team members were impossible to beat forever. See the attached image. Note that the defending team had new DC level 15 for Night vision Rey. Other counters did not work ...
Ideas
It's very much the correct behavior. That's like complaining Jawa can't take down a lone KRU cause he doesn't take damage from thermals.
JMK is the easiest counter to SLKR on D.
When you have video with the current sets vs the SLKR level 15 then you can talk.