In order to activate Global Abilities, the actors that support targeting on their surfaces need to satisfy two conditions:
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The targetable surface needs to have the actor tag ‘GlobalAbilityTarget’. This conditions determines if the ability can be deployed on a particular surface or not.
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It should block the ‘GlobalAbilityTargeting’ trace channel. Apart from the normally targetable surfaces like the AI Path meshes, this condition is also satisfied by the Kill Z volume as it helps the players track the reticule even when they the mouse cursor is focused on empty spaces as shown below:
So basically the reticule remains white on areas like these where the ability cannot be deployed, & turns to red on deployable surfaces based on condition 1) like the AI path meshes.
And as for the lack of grid cell detection, could you try moving the Kill Z Volume actor a few thousand units below it’s current position. It blocks all types of traces & I just want to make sure that it isn’t blocking the traces before they hit the grid cells.