In Patch 3.0 (Grail Knight update; June 2020), this change was applied:
However, just yesterday, I’ve encountered Beastmen in Righteous Stand, before the 2nd grim, at the city walls ‘Southern Axe Bite Garrison’ part. This was a Vanguard deed.
In another separate match, prior to the Outcast Engineer update, back in Oct. 2020, I’ve also encountered Beastmen in the same area in Righteous Stand. It was also a deed match, but it’s Sudden Death and Nurgle’s Rot, so it is probably not related to the Vanguard deed mutator nor the Outcast Engineer update.
The presence of beastmen in this map is anomalous:
Another anomalous thing is that the Beastmen are hanging out in close proximity with the Northmen. Related feedback post: