Logging in with Safari. The only options I have are:
Search Engine (Google)
Search Engine Suggestions (On)
Spotlight Suggestions (On)
Quick Website Search (On)
Preload Top Hit (On)
Passwords and Autofill (irrelevant to this issue)
Favorites (irrelevant)
Open Links (In new tab)
Block Pop-ups (On)
Do Not Track (On)
Block Cookies (Always Allow)
Fraudulent Website Warning (On)
Clear History and Website Data (I’ve done it)
Use Cellular Data (On)
Advanced:
Website data (zero bytes)
JavaScript (On)
Web Inspector (off)