The Umbral Amalgam battle pet is not spawning in Hallowfall. I spent an entire shadow phase killing critters and entering every pet battle I saw. Not one, front or back line. This makes the Khaz Algar Safari achievement impossible. I see several other posts about this not spawning since the daylight savings time change. There are several unattackable frog critters in the area that may be part of the bug. Please fix!
Update: I scoured Hallowfall through two other full Shadow phases after this initial one, still nothing. Very few battle pets had spawned in general, although I kept killing the critters everywhere. I checked every battle pet that was up, and not one Amalgam in the front or back line.