Not classic I know, but there were definitely PoP mobs around level *60* that did not summon. I spent much of my high 50s and low 60s root/charm soloing in PoT and PoV. Never was summoned. Actually, not even the occasional named mobs that I solo'd summoned.
So anyway, I'm sure that this means that there were 50+ *unnamed* mobs around in classic-Velious that did not summon. Maybe some named as well. This is also my recollection. Summoning mobs were not all that common, and the ones that did were usually avoided when soloing post-50.
Unfortunately all this means that it was indeed mob-by-mob, which makes it a pain in the butt to implement :/
I will search around for some proof.
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