List of steps to reproduce (step by step, including full links if applicable):

• Open Wikidata page such as https://www.wikidata.org/wiki/Q85850814
• See that there is no Add Statement item
• Also if you edit the labels it loads the page that tells you the page hasn't loaded properly

What happens?:
It does not load the Add Statement item so you cannot add new statements

What should have happened instead?:
The add statement item should have loaded (as it used to) so I could add statements

Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc:

Safari 13.1.2 on OSX 10.13.6. This is the last version of Safari (and OSX) that runs on my mac.