Dragonfly's unexpected behaviour

As was shown here:

Sometimes dragonfly doesn't enrage when all lavaes die out. The reason for this is a race condition between last lavae's selfdestruct timer (lavae.lua:166) and spawner's _OnSpawnTask delayed task (rampingspawner.lua:105). They start simultaneously and have the same 30 sec duration, so whichever one is called first is pretty much random. If _OnSpawnTask is called first, dragonfly spawns another lavae wave instead of enraging.