There was an actual localStorage Safari bug that was around for a while somewhat recently: https://stackoverflow.com/questions/67324683/safari-14-1-localstorage

There was an actual localStorage Safari bug that was around for a while somewhat recently: https://stackoverflow.com/questions/67324683/safari-14-1-localstorage-between-tabs-is-not-syncing https://stackoverflow.com/questions/67324683/safari-14-1-loc... It’s been fixed for a while, but the update mechanics definitely delayed the fix of the release; it was fixed in WebKit much earlier.