I had a VOT Pulser with syphon and radiation at once. It seems that it's not just a visual bug, from the damage it did.

The issue disappeared after having reloaded the game.

I noticed the issue first in Verdant Ridge after seeing a "Spreading the disease" dynamic event appearing instantly (Maybe it was just slow loading), and after about 3 seconds, all the raiders despawned (I guess it's part of the script?). The raiders were affected by radiation. I then completed the event, killing the afflicted enemies/zombies that spawned after.

Also, the proc seemed more frequent than usual.

Event: https://www.dropbox.com/s/gbgk7a2qyn...6-16_00007.jpg

Issue: http://youtu.be/stXLMFKPD2Q

Weapon: https://www.dropbox.com/s/b9t7o8jbyu...T%20Pulser.jpg

I haven't tried to reproduce it. Good luck.