It is 00:00:00.Is there a Duration set in the Props?
That could cause it to despawn, after the duration has elapsed.
1. I don't think so. I have tested it 1 field from exemplary spawner (as player ofc.)Hmm. A few possibilities.
1) Smart Spawn is on and you wound up fighting the mobile outside the spawner's range.
2) You're staff, which can cause oddities
3) You could have the setting that respawns everything together true on that spawner.