Doesn't hydrate when there are html comments

[ghost]

• Check if updating to the latest Preact version resolves the issue

Describe the bug
If hydrating markup that contains html comments, a confused re-render happens. It should probably skip comment nodes, or ideally treat them as first class citizens.

To Reproduce

Render component to a string, add some html comments, try to hydrate.

Steps to reproduce the behavior:

1. Render a component to string.
2. Add some html comments.
3. Try to hydrate.

Expected behavior
Should hydrate component but it gets confused and causes duplicate nodes.

[developit]

This is fixed on restructure and will be in Preact 11.