How do you mean disappear? When you kill the suit of armour not all the pieces show up on drop?

We know suits of armour might just disappear while theyre still alive, taking your armour pieces with them, there's no fix for this problem yet nor any idea how to solve it :/

It died and everything vanished, no tokens, and no armor on the ground.. just poof.

The armours disappear either when trying to spawn the NPC (doesn't spawn) or when you kill it (vanishes, just said above)

Any way to force this bug. It's been reported numerous times, but yet I still have no idea what causes this.