Safari 14 had this nasty IndexedDB bug last year: https://bugs.webkit.org/show_bug.cgi?id=226547 and I had to add https://github.com/jakearchibald/safari-14-idb-fix to all my sites using IndexedDB. Now this. Why the hell are they messing with IndexedDB?
Last IDB shitstorm was discussed at https://news.ycombinator.com/item?id=27509206.