This is one of your troll points, always exaggerating the degree of Pro-Beijing in Taiwan.
The Republic of Chinese/Taiwanese were probably just fine with the depiction of the dashed line in the SCS, however.
Not Taiwan's fault that China is one of 5 permanant members on the UNSC or that China was allowed into the WTO.
AFAIK, that's another complication WRT the SCS dispute. Taiwan essentially has the same claims as the PRC IIRC.
WRT the Abominable movie, the only one raising the issue in the Philippines is the media, specifically Rappler, the Inquirer, and other newsies that are critical of the current Duterte regime. Anyone else doesn't give a shit about it. Sadly.
It is an interesting complication, particularly in that the dashed line claim actually originated with Nationalist China, before Japan and Japanese gave that fledgling state other more pressing matters to consider regarding Sovereignty.
I remain unconvinced that a unified Nationalist China would automatically present less of a postwar problem for Japan and others to deal with in Asia, and can envision situations in which it would present more.
Regarding the movie, I don't actually forsee it being banned in either Japan or the United States either. We shall see.