custom form element with name attribute breaks lit-template

[christophe-g]

the createHiddenInput method called when a polyfilled element has a name attribute breaks lit-template (the dom is manipulated outside lit and the refs of the template are then incorrect).

First render of the template is correct, subsequent renders might be broken.

I am reporting it here (even though it is arguably more of a lit issue) because it is likely a lot of consumer of this polyfill will be using lit (through @material/web).

I am also not sure what kind of workaround could be proposed.