I had a Glimmer Seeker into play; opponent used -2 of Kaito, Bane of Nightmare on it during his turn; tapping it and putting two stun counters on it.
During my turn; the "Survival" didn't trigger even tho Glimmer Seeker was indeed tapped.
I was not able to find a ruling saying that a stunned creature doesn't trigger it's "if tapped" effect.
If such ruling exist; then I apologise for the wrongful bug report.