After more investigation I’ve discovered:
If “Force language in custom links” is set to YES
– navigation functions (menu, posts, etc) does not work correctly in Chinese = 404
– hyperlinks to other articles within the post serves the correct Chinese version
If “Force language in custom links” is set to NO
– navigation functions (menu, posts, etc) works correctly in Chinese
– hyperlinks to other articles within the post serves the English version, not Chinese. (I’ve left it this way because at least it doesn’t serve 404 errors but obviously, it isn’t correct)
Is this a TranslatePress issue or my Theme (Soledad)?
Thanks!