Tora Mission spawns too many spiders around the soul eater monster

Got a massive lag spike as I killed some of the spiders with my frostblades
They seemed to spawn way too many copies and fed the soul eater monster in the middle.
Took an essence drain & contagion to finish it off.
Probably one cause of the massive performance problems earlier on the server?
On the screenshot you can see the aftermath.
Bug report reference number is 2.380.471.198