Devouring Spawn mobs from the Voidscar Arena appear to have severely broken leash mechanics.
After aggroing one, the mob continued chasing me across an extreme distance without resetting. I was able to kite it from Voidscar Arena through Path of Predation and all the way toward The Master’s Perch before it finally died.
This mob maintained aggro far beyond normal behavior and appears capable of pursuing across major sections of the zone instead of properly disengaging.