Dark Mage not dropping yellow bone portal consistantly

[Reveal]

It seems like yellow bone portal is only dropping on the dark mage kill 50% of the time or so:

Tomoe swings at Dark Mage, but he dodges out of the way!
Qwert swings at Dark Mage!
Qwert critically jumpkicks Dark Mage for 271 damage!
Qwert jumpkicks Dark Mage for 71 damage!
Qwert jumpkicks Dark Mage for 65 damage!
Qwert critically jumpkicks Dark Mage for 226 damage!
Qwert swings at Dark Mage!
Twogirlz raises their palm towards Dark Mage!
A holy symbol springs forth and burns Dark Mage for 96 damage!
3 runic drop to the ground.
16 platinum drop to the ground.
470 gold drop to the ground.
1897 silver drop to the ground.
With a final utterance, the Dark Mage completes his spell! You've failed!
You gain 333333 experience.
*Combat Off*
Saitama picks up some runic coins
Twogirlz started to follow you.
Saitama picks up some platinum pieces
Tomoe casts natural prowess!
[HP=834/MA=294]:.@do fol rev
You say "@do fol rev"
[HP=834/MA=294]:
Bone Cavern
You notice 470 gold crowns, 1897 silver nobles here.
Also here: Saitama, Tomoe*, Qwert*, Twogirlz, Azrael, Placido.
Obvious exits: None

[Winterhawk]

We have tracked down the issue and will work on a code fix to solve it as soon as we can.