There's an extension for Firefox and maybe Chrome that should help. I think it's called ClearURL, or something similar. It removes the trackers from the ends of URLs
EDIT: That's assuming that it's a legitimate tracking URL, and not something that's been added by malware.
These are not tracking links in the conventional sense where they append tracking data to the legitimate link. They just hijack the link that someone else posts and replace it with an entirely new tracking link with a l.facebook.com domain.
No link cleaning software I have found works because of this.
I use LibreWolf and maximum protection just for FB and similar web pages, and Firefox for normal browsing or other safe sites and my problem is solved.
If it's showing at the bottom of the browser, then the browser thinks the link is a regular link, but clicking or copying it may invoke some JavaScript that either manipulates the link or simply redirects to the tracker site after an onClick event. I'd like to see this for my own curiosity. If my thought is correct, then there should be some way to disable that specific method call with uBlock or some other mechanism. I'm curious what happens with a text based browser or screen reader type browser. You could also trace the JavaScript and see what's happening. If this is really happening with the big social media sites, it's just a matter of time until a plugin is developed to correct the behavior.
I'm gonna sound like a dick who didn't really address the intended question, but why use those sites? Not being on corporate social media solves the problem. I know that doesn't work for a lot of people, so apologies to those folks.