Man, this is was dumb move and I'm guessing you pissed off a lot of developers who are have apps published on Apple Store and Google Play..
I have my game developed on C++ and published since October last year using Cocos2d-x v3.6 and I was happy so far with it, until I decided to improve it's performance on Android and add some other features. So, I decided to upgrade it to the latest version of Cocosd2-x v3.13(which hasn't been released yet, but the code is on github) because it adds support for ETC1 with Alpha. After making all the changes to make my game work with the new version I was surprised to see that my scenes created on Cocos Studio didn't work as expected, sprites not being loaded anymore, etc.. I decided to see if there was an update and I found out that Cocos Studio is deprecated supporting up to version Cocos2d-x V3.10 and it may not work with latest versions.
So, I downloaded Cocos Creator to find out that it's purely JS.
I'm stuck now with a new Cocos2d-x V3.13 with the feature I want and my scenes don't work anymore.
The only solution I see is to migrate my code to version V3.10 and try to implement myself the ETC1 support for alpha on it.