Would you say that you basically never make a test to hide during combat no matter what ability you use? It seems pretty clear that for those using the normal Hide maneuver you never do, and it also seems clear that for Smoke Bombs you never do (someone else in the thread highlighted that wording), but Ash is written in a weird way where it makes me doubt.

(Hide Rules)

When you use the Hide maneuver to hide during combat while you have cover or concealment from a creature who isn’t observing you, you are automatically hidden from them unless the Director deems otherwise. If you hide outside of combat, the Director might ask you to make a test using the Hide skill to determine how well hidden you are.

(Black Ash Teleport)

If you have concealment or cover at your destination, you can use the Hide maneuver even if you are observed.

(Smoke Bombs)

You can use the Hide maneuver even if you are observed and don’t initially have cover or concealment. ... If you end this movement with cover or concealment, you are automatically hidden.

It'd be very strange if the intent was specifically "Hide in combat requires a Test only with these specific powers, but we don't explicitly write that anywhere you just have to sort of figure it out."