What about Pidan-som island with North Korea? I though Taiwan de jure does not recognizes territorial changes made under PRC, and this island was made North Korean under a treaty signed by the PRC with North Korea in 1964
It doesn't. (https://en.wikipedia.org/wiki/Pidansom)
Also, Mt. Paektu (alternatively Changbai) is also claimed by the Republic of China, since Taiwan does not recognise the Sino-Korean Border Agreement made between the PRC and DPRK.
So de facto, that would add North Korea to the list of terrotorial disputes.
And de jure, South Korea as well, since South Korea also claims those lands.
Also, Mt. Paektu (alternatively Changbai) is also claimed by the Republic of China, since Taiwan does not recognise the Sino-Korean Border Agreement made between the PRC and DPRK.
So de facto, that would add North Korea to the list of terrotorial disputes.
And de jure, South Korea as well, since South Korea also claims those lands.