Hey @RichardC, as before, I suspect there is a javascript issue arising from something else on your Wordpress, or browser.
Wordpress instances can include any number of scripts, plugins and other modifications that can affect the operation of javascript on an instance. The display of the link status relies on javascript being able to run smoothly.
The fact that it’s gone and come back again in a period in which nothing in that sidebar has changed in the WP Discourse plugin reinforces that theory. This suggests something else is changing.
It’s hard to diagnose that remotely. I would either need access to your editor (happy to look at it, if that’s an option; pm me about that), or access to browser console logs from when the issue occurs.