Actually yes, Survival Multiplayer 🙂
Confirmed the despawning of NameTagged creepers.
Also, the NameTag is placed back in the user's inventory after the despawn.
Reproduce:
1) Use a NameTag on a creeper and trap underground
2) Teleport away
3) Leave Server
4) Creeper will despawn and NameTag will be in inventory
Zombies, Spiders, and Skeletons did not despawn.
We love pets in Cloud city🙂 But our creeper box is empty😞
Not easy to get a creeper boxed though in 1x2 glass panels🙂
It was sad when he despawned shortly after the painful efforts.
We then reproduced the bug several times just in caves.