While vanished if you try to use a tinder you become unhidden and no tinder gets placed. It then sets the 60 second timer for re-use.
The text reads as:
You attempt to use Everspark Tinderbox
You are no longer hidden!
You cannot form the words to cast. The spell fails.
----
At this point once vanish is over the time for the tinderbox is there but of course no tinder was dropped
The text reads as:
You attempt to use Everspark Tinderbox
You are no longer hidden!
You cannot form the words to cast. The spell fails.
----
At this point once vanish is over the time for the tinderbox is there but of course no tinder was dropped