In the meanwhile, you can workaround that using delete Document.prototype.adoptedStyleSheets.
When called prior to loading LitElement, this will make it act like the feature does not exist and place style elements into the shadowRoot (same as Firefox and Safari).
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There is an issue to fix that already so I hope it would be resolved in future:
bugs.chromium.org/p/chromium/issue...
In the meanwhile, you can workaround that using
delete Document.prototype.adoptedStyleSheets.When called prior to loading LitElement, this will make it act like the feature does not exist and place style elements into the shadowRoot (same as Firefox and Safari).