I believe that Disney no longer allows physical releases of their new movies to be listed for sale more than a month away from the Blu-ray/4K release date. This started a few movies ago I believe around the time of Mulan/New Mutants or maybe later.
When they do pop up for sale early, all the listings seem to disappear from all online sites (Best Buy, Amazon even eBay). I've noticed this in Canada and other places and now Australia.
Lately the pre-order listings can show up as little as 2 weeks before the release date in North America now.