fire explosion from mob death never gone off in delve until touching it

Dear GGG.

I was delving at dept 205 for speed run. my ranged minions were killing off the mobs which upon death would create fire explosion (stackable).

Unfortunately, one time my ranged minion were killing too many of these mobs and I see too many explosion that would mean certain death even if I tried to teleport pass it (area covered too big). So I did the usual hiding until the explosion all gone off.

However, when I was hiding in darkness at a corner (with degen buff on) because my light radius wasn't optimal, the explosion that was suppose to be off within 5 seconds never happen. The red area where explosion suppose to occur stayed VERY long time and I was basically getting my life drained away in what was supposed to be a temporarily staying spot. After waiting for more than 10 seconds in the dark I couldn't really wait any longer, so I attempted to flame dash out but never made it. As soon as I touch the red explosion circle every circle went kaboom for an instant death.

thanks