FYI: Still experiencing this loop in Nov 2020 using:
(Chrome 86.0 and Firefox 82.0 are OK).
FYI: We are also experiencing this concern with our custom App. Using Chrome is the current work-around but presumably over time, browsers will become more strict and this infinite loop problem in Safari may also occur in other browsers. Senior staff at Apple Support have not been able to help.
More Actions: Edit Book Metadata to load our app
A popup requesting access
And an infinite loop...