Symbol exception in IE11 again @ 3.1.0

[scrollbar-ww]

i use rollup + babel@7 + core-js for bundling my web app,
after update core-js from 3.0.1 to 3.1.0, i got a new symbol exception .

@ core-js/packages/core-js/modules/es.symbol.js :

$export({ target: 'Object', stat: true, forced: fails(function () { getOwnPropertySymbolsModule.f(1); }) }, {
  getOwnPropertySymbols: function getOwnPropertySymbols(it) {
    return getOwnPropertySymbolsModule.f(toObject(it));
  }
});

"getOwnPropertySymbolsModule" equals undefined, which import from:
var getOwnPropertySymbolsModule = require('../internals/object-get-own-property-symbols');

there was a similar exception with 3.0.0, but fixed in 3.0.1.
https://github.com/zloirock/core-js/issues/513

[zloirock]

How it could be equals undefined? object-get-own-property-symbols exports an object.

Please, provide more info or a reproducible example.

[scrollbar-ww]

sorry, it's "getOwnPropertySymbolsModule.f" equals undefined, in IE 11

[zloirock]

I have no ideas in which case it's possible. Seems a new kind of strange rollup optimizations. In which engine you have this problem? Maybe you could create a reproducible example?

[scrollbar-ww]

sorry again, it caused by another package, that try to implement window.Symbol, but not completely.
it makes "NATIVE_SYMBOL" equals true, without "getOwnPropertySymbols" method.
but the strange thing is, it's ok with core-js 3.0.1

[zloirock]

I'll add an additional check for NATIVE_SYMBOL, thanks.

[zloirock]

Added.

[PikachuEXE]

In case people don't know
The fix is committed in 08d2f56