Safari is the new IE when it comes to bugs and standards compliance.
Here's an example that broke many many sites that use OAuth2 Auth Code Flow for login (including the main UI portal my company provides clients):
https://bugs.webkit.org/show_bug.cgi?id=194906
This was also an issue in iOS, and since Apple doesn't let any other browsers actually use their own rendering engine on that platform (they're just wrappers around Safari's guts) this was broken for all iPhone users no matter the browser.
I was surprised to see your comment, in Safari, directly below the uBlock Origin icon. It seems to be working fine for me. Do you have more details on what you mean?