Read moreThis revealing actually only got fixed for Lux E a little while (year or so) ago.
"Targeting" enemy units with
single-target
,area
,pointblankAOE
, orcone
targeting type while the enemy team has no vision of you creates a reveal bubble on you at the start of the cast (when the engine-level targeting happens), unless the spell has this turned off with a parameter.The actual "targeting area" for area and cone spells is typically NOT what's actually used by the spell script afterwards; It's just a leftover of a type of targeting that they never fixed to even work with cast times (so before they were each changed to just do this at script level, cone spells like Darius E would "find" their targets on cast start, and then affect them at the end of the cast time - wherever they went).
Anyway, since this whole emerging reveals stuff is super obscure and controlled by spell data that isn't directly maintained or ...
maybe/definitely it's intended