I see what you are doing here. But being able to edit title is so convenient, I couldn't live without it.
Maybe add a heads-up notice saying the URL has been specifically edited after some time has passed since post creation? e.g. Two hours?
Or do something like what Twitter is doing now, letting users add specific context on the title notifying people about what changed, even confirming misinformation?
Or always crosscheck the hyperlink in title or body with an open-source malicious site database and flag all malicious sites once and for all?