As you can see from the following progression, I have a link, little bubble indicates the URL on mouseover.
If I right-click on the link and select Ulink (top of context menu), all but the first character in the link gets selected. So, only that part of the link gets unlinked. As you can see, if I mouseover that first character, the URL still shows up.
To get rid of it completely takes a second step.
I have to make a manual text selection that includes that first character and select Unlink a 2nd time. Then it’s all gone.