The main reason is that Naijun left Mihayou. Naijun told everyone that the reason for leaving is to realize his dream, and then he will definitely fight for his career, so he has no time to match the voice after Amber, so he will eventually change Amber's resume.
Naijun is an old employee of Mihayou, and has played with all the characters in Collapse Academy 2 and Collapse 3, Hilf Ai Le, Collapse Mother and Magic riccardo chailly. Cv after Amber has been released, but version 1.4 will be released.
Extended data
Message event:
Amber Chinese CV Milk Jun officially announced that he would leave Miha Tour in July 2020. According to my own statement, he wanted to "fulfill his dream", so he resigned and set up his own studio. Due to the busy work at the beginning of the business, Naijun said that he could not continue the dubbing work of amber, so Mihayou had to change the dubbing.
According to the official statement, it is possible to replace the previous voice content together, so that even if the CV is replaced, there will be no disharmony. The actual situation still depends on the installation of 1.4 version.