Hi my guess this is a BUG in the link Block. Pls. read this
Thanks for posting about this. You are right, this is definitely a bug.
Our team is investigating what causes this to happen, as it seems there are no clear steps to reproduce the issue at this point.
That said, it does look like deleting and recreating the link is a solid workaround to unblock customers that encounter it, until we can find a permanent solution.
Thanks very much for you help in reporting this