I don't remember any aircraft carrier on earth, where are aircraft parked over arresting cables while recovery is in progress. We can all search the internet for photos about this.
Well, I think there is a difference between arresting cables which are "free" i.e. the part of the cable meant to be caught, vs the part of the cable which is exposed between the sheave and the under-deck parts of the arresting cable apparatus (boxed in blue, below).
Obviously the free part of the cable is much more mobile and able to move and potentially flop about during the catch process, but the "blue" parts of the cable between the sheave and the under-deck apparatus has far less freedom for movement during the catch process.
Therefore, I think the biggest "danger" of the blue parts of the cable is the rapid tension and flat movement of the cable at that location which may present some danger to deck crew operating near that part... however the movement of the cable will mostly be flat rather than vertical. I think the biggest danger therefore is crew accidentally stepping on top of the wire, which would result in significant physical risk to them due to the sudden movement of the wire during the arrest process.
I think there is very minimal danger of the blue part of the cable to aircraft which are parked above it without having any part of the aircraft or personnel in physical contact with the blue part of the wire.
Of course, on USN carriers, the "blue" part of the cable is partly below deck and the more exposed parts of the cable are covered up by a small unobtrusive "roof" thus allowing crew to potentially step "atop" the blue part of the cable" and still remain safe during arrest operations. I imagine a small unobtrusive cover could be a viable solution for Liaoning and other carriers as well if they adopt the same arresting gear type.
