I am unsure if this is just a necessary result of the coding. No matter how high you are at when overlooking a drop, Skeletons and Spiders will attempt to target the player even though they might be extremely outside of range.
This isn't a problem in most cases, but in amplified worlds odd mob behavior occurs when overlooking cliffs. Skeletons may end up shooting eachother or other mobs in attempt to hit a player far out of its reach.
A limit does seem to exist for other mobs like zombies or creepers, but it can still seem odd when you are over 60 blocks above them.
The described behaviour cannot be reproduced on 1.15 Pre-release 1.