Tibet, possibly, according to a 2000 LA Times article:
But Taiwan’s Democratic Progressive Party--whose leader, Chen Shui-bian, will be sworn in three weeks from now as the government’s first non-Nationalist president--makes no such claims for Tibet.
“The DPP will continue to support the Tibetan people’s struggle for freedom,” declared a party position paper in 1997. “Tibet is neither a part of China nor under the jurisdiction of the [Nationalist] government in Taiwan.”
It's less than 100% clear though what happened after the DPP came to power. It's also difficult to measure this more objectively than at the level of those statements since neither Tibet nor Taiwan are UN-recognized.
Also, according to one Wikipedia page, the Taiwan MFA map is no longer claiming Arunachal Pradesh as part of China. I cannot read Chinese myself as to the finer print of this map, but clearly Arunachal Pradesh is in green there and not otherwise delineated from India.
On the other hand, that map does include Tiben in some kind of China, but I don't know what the label reads.
Also, PBS reminds us that even in 2022:
Taiwan’s KMT-drafted constitution continues to recognize China, Mongolia, Taiwan, Tibet, and the South China Sea as part of the ROC.
But as I noted in some comments under the Q, that constitution appears to have been de facto ignored/violated with respect to Mongolia since 2002, as Wikipedia notes:
Relations changed in 2002, ninety-one years after Mongolia's first declaration of independence. At the time, the Republic of China still did not recognize Mongolia as an independent country; official maps of the Republic still showed Mongolia as its territory. When the Executive Yuan under the Democratic Progressive Party administration announced that Mongolian nationals would be entitled to visas rather than entry permits when traveling to Taiwan, the same as individuals from foreign countries, the Kuomintang-controlled Legislative Yuan criticized the implementation of the decision, as they had not been consulted in this regard. Later, representatives of the two governments agreed to open offices in each other's capitals; ROC's office in Ulaanbaatar was opened in September of that year. ROC's Ministry of the Interior then decided to discontinue including Mongolia on its official maps of ROC territory, and on 3 October 2002, the Ministry of Foreign Affairs announced that ROC recognizes Mongolia as an independent country.