Small aside lest we forget how unreliable leaks can be: remember that last year that were some leaks that had Sabine showing up in Mandalorian season 2, played by Mercedes Varnado? Which of course turned out to be bogus.
Indeed, that leak may have in and of itself given away where it was coming from; specifically someone involved with "The Gallery" production side of things, since that's where 1) about everything that did leak from Bo Katan to Ahsoka, and Boba could be sourced, 2) was the only time in any official released images that I've seen, Varnado was show in costume, sans hairpiece and just sporting her actual hair (which is very colourfully dyed not unlike Sabine's), and of course 3) it had zero footage or mention of Luke, which was about the only thing that didn't leak from that season.
Point being, even when they're "real", often the people responsible for these leaks aren't actually in the know, they're just tangential to the production, or the marketing, or merchandising pipelines and may have laid eyes on *something*. Doesn't mean they actually know what's going on.