Due to the policy change from "porting" to "translation", the legal code redirecting mechanism for the old 3.0 and other former ported Taiwan version on Legal Code has been failed for quite a while.
For example, in the Common Deed for CC BY 3.0 TW: https://creativecommons.org/licenses/by/3.0/tw/ , when you click on the "Legal Code(授權條款)" button, it will lead you to a "Not Found" page (https://creativecommons.org/licenses/by/3.0/tw/legalcode.zh-Hant). That's because this kind of redirecting link is just for 4.0 based on the translation policy, adding the string ".zh-Hant" after the "legalcode", however, this shall not be performed due to in the former ported version there is actually no any ".zh-Hant" string.
Easy way to tackle this is just inserting some "mapping" mechanism, such as:
I received an email reporting this: