Spiders rarely attack

Came upon a spider spawner (not cave-spider) and killed the spiders that huddled around the door. About 5 spiders were left and when I went to battle them they just stayed on calling and wouldn't attack (unless I struck first). I then noticed that the newly spawned spiders didn't attack either.

About 80% of the spawned spiders seemed to ignore me.

Beta Text Line1: v0.15.90 alpha build 1 GuiScale-5
Beta Text Line2: LGE Nexus 5, Adreno (TM) 330, Android 6.0.1

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Affects spiders naturally spawned and spawned from eggs also.