In Classic, true undead remained kos to player regardless of level. Even at 50 if you walked on top of a decaying it would start attacking you same with dry bones in oasis. The aggro radius should lower gradually as you get higher level, but they will always attack if you go nose to nose with them. This allows you to move a bit more freely around the house at a higher level and cause less brutal trains which is what you might be thinking of.
Could you be more specific with the mobs that are having this issue? Anything that is alive, such as death beetles in UR or plague rats in Bef should 'grey out' and no longer attack at a certain level discrepancy.
Both bone barbs and ghoul carrion dropped in classic, but I distinctly remember leaving the carrion to rot because it was worthless.
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