I'm not sure on this one, as I actually think they should get targeted. But I also think in some situations that it should not target them, and the game has no context for it...
An example would be this I guess ?
Attachment 51904
Which has 3 npc bats, and a player. Only one bat is 'shown' to the player. ( player screen is on the right of the image, gm on the left. )
If the player drags on a fireball, and targets they get to see 'bat 3,2,1' on the target list. The player screen even with the 'arrows' to selected target does not 'give the position' of bat 2,3 away.
But I'm sure the player and I'd agree, that all 3 bats are about to take damage ?
When the damage is rolled, the GM sees the bat 2,3 damage with the 'hidden' icon, and the bat 1 damage... and the player sees only bat 1 damage.
I guess the question is 'should' the combat tracker show hidden NPC names if they are targets or not ?
If its this is hidden from the player on the combat tracker, it might still be selected without them knowing, when they target something else next round ? ( How would they resolve this.. )
Also if they were not targeted, then the DM would have to hand 'fix' the damage on 'bat 2,3' because they should have taken damage. ( Not been shown on the CT, is not 'invincible' )
I'm inclined to say this is fine, unless my player was 'fafing' with the spell token... and selecting targets, moving the spell token, and re-selecting to try and 'find' hidden. In which cased I'd be telling off the player to finalise the placement before targeting..
Can you give a better description of the exact situation in your game, player/npc basic name, and why the gm thought this was an issue ? ( Just some basic context so we can chat about it.. )
-pete