A valid argument can be made that they can’t get back something they never had, and that ROC has a stronger claim than PRC, which never ruled the island.
When you did your "Title Search" on the property....how far back did you check?
China is the oldest continuous society on Earth is it not....with many a government and claims of lands owned down through the Years....even Centuries....so who is the rightful owner in your view?
Is it China (now known as the PRC), Japan, or the Taiwanese (known today as the ROC)?
What effect did the several Treaties, Wars, and Rebellions have on who has rightful claim to Taiwan?
https://thediplomat.com/2021/06/was-...part-of-china/