Hello Shaman,
A hotfix went out today that improved the logic of Flame Shock spreading as seen in the hotfix posted very recently:
We have been looking at various discussions after the change was applied to the live servers, and we’re going to be re-adding the functionality of your Lava Lash also refreshing Flame Shock on your primary target while keeping the updated spreading logic.
A quick note that was accidentally left out of the hotfix notes for today, Flame Shock should no longer spread to targets that have crowd control effects on them that will break from damage, such as Polymorph. We will get the hotfix notes updated.
I don’t know if the new hotfix will go out tonight or tomorrow, but it’s being worked on and we’ll be sure to update things when it is ready to go.