upgrade babel-runtime 6.x

Hello, I'm currently upgraded my babel configuration to newest one (from babel 6 to 7) and it worked great. But after I installed core-js 3 for polyfills, rc-slider started to give me errors.

ERROR in ../node_modules/core-js/library/fn/symbol/iterator.js
Module build failed: Error: ENOENT: no such file or directory, open 'xxxr/node_modules/core-js/library/fn/symbol/iterator.js'
 @ ../node_modules/babel-runtime/core-js/symbol/iterator.js 1:30-75
 @ ../node_modules/babel-runtime/helpers/typeof.js
 @ ../node_modules/babel-runtime/helpers/possibleConstructorReturn.js
 @ ../node_modules/rc-slider/es/Slider.js
 @ ../node_modules/rc-slider/es/index.js

Almost same error goes for other core-js 2

ERROR in ../node_modules/core-js/library/fn/symbol/index.js
ERROR in ../node_modules/core-js/library/fn/object/set-prototype-of.js
ERROR in ../node_modules/core-js/library/fn/object/get-prototype-of.js
...

My question is - why babel-runtime 6.x is required and 7 is not being used for rc slider?

Sorry if i'm posting this to wrong dependency but if I am - where should I post

Start with the Babel configuration and the dependency paths shown in the trace, especially babel-runtime/core-js/symbol/iterator.js and rc-slider/es/Slider.js. Reproduce the reported build with core-js 2 and 3, then verify which babel-runtime version rc-slider resolves. Done means the dependency relationship and supported Babel/core-js combination are established.