If you have a multiline URL (i.e., a full URL that links to the same URL) in your document, then delete the links in each of the lines using then contextual menu > Delete Link, and then select the link text and Create Link… the URL will auto-populate the link destination field and Link-OBJR will appear in the tag tree. So far, so good.

But as soon as you click OK, then the Link-OBJR tag disappears.

If instead, you link from normal text, and follow the same procedures, then the Link-OBJR tag remains and the resulting PDF passes accessibility validators.

It's possible to work around this bug, but it's a super-laborious and error-prone process. can you please add this to the list of bugs to squash?