This issue reproduces for me on multiple browsers (including chrome), and for luchak (on chrome 98).

Warning: this bug deletes all BBS saves - not just the ones of the carts used to reproduce it.

Steps to reproduce:

1. Load some cart with a save in it, verify that the save works. I used https://www.lexaloffle.com/bbs/?pid=94408#p (you can save/restore via menu)
2. Open new tab with some other cart. I used https://www.lexaloffle.com/bbs/?pid=108109#p
3. In this new tab, press play and immediately switch to the old tab
4. Refresh the old tab and check if your saves are still there. They will not be.
5. If you want to see your saves again, switch to the new tab and let it load. If you don't care, delete the new tab - your saves are now gone forever.

It looks like when a game is first loading, it deletes the local storage (well, indexed db). Then, a bit later, it restores it.

im bumping this thread because it still seems to be an issue