Should this be an RFC?

• This is not a substantial change

Which package is this a feature request for?

Other/unknown (please mention in description)

Description

in server frameworks like next.js, it may be possible that enable-lit-ssr.js might run multiple times in the server, leading to createElement being wrapped multiple times.

part of the observation described #4527 (comment) and from the stackblitz example shared there, refreshing the page causes error because multiple <template shadowrootmode="open"> elements are added to a single custom element.

we're already setting a global flag from this so we could guard the patching of createElement behind that flag too.

Alternatives and Workarounds

.