Two zigs in the depths - bug or feature?

[Turukano]

In the YASD/YASP forum mopl and Octopode-monk-of-XOM said they recently had two zigs in the depths. mopl was playing the 0.15 version.

Is this intended? If so, what's the probability of getting two zigs?

[Sar]

One could've been a mimic.

[Turukano]

One could've been a mimic.

mopl posted that he checked it:

I won't complain, but is it normal to find 2 Zigs in Depths ? I checked : no mimic !

[Patashu]

Can't zigs also be placed by vaults?

[Octopode-monk-of-XOM]

i also played 0.15 tiles offline, and cleared both zigs. no mimics