Spiders and cave spiders do not flee from armadillos, when enabling "Update 1.21" experimental toggle

Spiders and cave spiders no longer flee from armadillos.

I previously conflated this bug with MCPE-178560 as they were relatively similar and both introduced in 1.20.70.21, but while that has now been fixed and spiders again counterattack mobs and players, they still do not flee from armadillos. The reason for the regression may potentially be similar, however.