What you were expecting to happen, and what actually happened:
Just got a pet gnome and got Sad Panda.
Sad Panda is the PET Gnome from Lyrszas Lair and is not supposed to be a reward for a pe t gnome!
How often does this happen? When did it begin happening?
happened right now
Steps to make it happen again
wait for the next pet gnome, midnight, fullmoon and howl at it.
It appears both were reported over the weekend (which starts earlier in Australia than it does for most of us) so they likely havn’t even looked at it. Since both were Sad Pandas and from the most recent delve it is likely just a missed flag that says “dont spawn me from pet gnomes!” or whatever they went with.