It might have something to do with cookies or icognito mode.... Or even the brave browser.
Basically anything that blocks the games ability to set a few save slot prep things. I try to access local storage when the game loads so I can delete old saves so they don't get stuck in memory and take up unessesary space. But Icognito or brave browers just crash the game when I looks for old saves.
I may have a fix for this... that is if this is even the cause of your issues.