[w3c/webcomponents] Input element autofill strange behavior on Chrome when in shadow DOM (#894)

I come accross this issue in on of my project where I use custom components which generate elements in the shadow DOM. 
Simple example of the problem can be seen  [here ](https://codepen.io/kjantzer/pen/rNBEyEP) and I can't figure out how this is fine behavior on Chrome.

When the input is in shadow DOM and autofill options appear only hovering upon any of them "ghost selects" the one.
Is there any workaround to avoid this behavior on Chrome, or the only way is to disable autofill (which I don't want).
I've tested it on other browsers and there is no such issue

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https://github.com/w3c/webcomponents/issues/894