If I format a link with the editing tool, it works fine in preview, but the link disappears when I post, leaving only the text description in the post.
This has happened to me repeatedly, most recently on this post:
https://www.mumsnet.com/talk/_chat/5276546-come-and-tell-us-your-dull-and-unexciting-news-33-calmly-through-the-day?reply=144687393&utm_campaign=thread&utm_medium=share&utm_source=copylink
This on Firefox on Windows 11.