They are aware but there is lack of deterence to protect common national interests from both sides unfortunately. It's impossible to give individual security to each and every Chinese working in Pakistan, infact this will give the bad impression of Pakistan with gun touting guards following our guests. The security comes with deterence. Those who plan such acts must know that they might get away with their scheme but sooner or later they will pay with their lives, regardless if they are hiding in Delhi, tel Aviv or Washington.
This is what Head of American national intelligence, Daniel coates said just recently,
He is the ultimate boss of CIA.
http://nation.com.pk/national/12-May-2017/cpec-to-offer-militants-additional-targets-us-official
CPEC to offer militants additional targets: US
Anyone with little knowledge would know that was the subtle warning.
Pakistan and China must form global death squads to neutralise individuals working for hostile intelligence agencies in their own backyard. Chinese secret societies and mafia can play a very handy role here.
http://www.rense.com/general77/chinsec.htm