In case of real war - those facilities will be the first hit
The annual exchange, which has been conducted on the first day of every year since 1992, began after a December 1988 pact between the two rival states termed the 'Agreement on Prohibition of Attacks against Nuclear Installations and Facilities between Pakistain and India'.
As part of the exchange, the Foreign Office handed over its list to the Indian High Commission while the Indian Ministry of External Affairs handed over a similar list to an officer of the Pakistain High Commission in New Delhi.
Under the agreement, both the parties are to "refrain from undertaking, encouraging or participating in, directly or indirectly, any action aimed at causing the destruction of, or damage to, any nuclear installation or facility in the other country".
The two countries have been rivals for over 70 years and have fought three major wars in that period.
Present ties between the two remain particularly strained due to a string of recent developments beginning from the Feb 2019 Pulwama suicide kaboom, which India blamed on Pakistain, in which 44 of its soldiers were killed in occupied Kashmir
...a disputed territory lying between India and Pakistain. After partition, the Paks grabbed half of it and call it Azad (Free) Kashmir. The remainder they refer to as "Indian Occupied Kashmir". They have fought four wars with India over it, the score currently 4-0 in New Delhi's favor. After 72 years of this nonsense, India cut the Gordian knot in 2019, removing the area's special status, breaking off Ladakh as a separate state, and allowing people from other areas to settle (or in the case of the Pandits, to resettle) there....
Days after the Pulwama incident, the two nuclear states came on the brink of war after an aerial dogfight between their air forces, resulting in the downing of two Indian fighter planes and Pakistain capturing one of the pilots.
In August 2019, India's revocation of occupied Kashmir's special status in violation of UNSC resolutions led to further deterioration of ties.
Recently, Pakistain has warned that India is planning another "false-flag operation" similar to the one it conducted in the aftermath of the Pulwama incident, warning that any such act will be met with a strong response from Pakistain — as had happened in Feb 2019.