Heya Graeme,
Apologies for the delayed response here, and thanks for reaching out and providing such a detailed description of the issue. That’s certainly unusual, and it’s not the expected behavior when editing a message with a hyperlink.
I’m sorry to hear about the inconvenience this issue may have caused as well. I want to assure you that we take all feedback seriously and rely on it to improve our platform.
I’m going to escalate this issue to our developers for review. In the meantime, if you encounter any other irregularities or have further questions and discussions.
Cheers,
~John 