The algorithm for [Serializing HTML fragments](https://html.spec.whatwg.org/multipage/parsing.html#serialising-html-fragments) was recently updated to serialize any potential children of void elements as the empty string, in https://github.com/whatwg/html/pull/4238.
The algorithm for Serializing HTML fragments was recently updated to serialize any potential children of void elements as the empty string, in whatwg/html#4238.