This error was not happening just a week ago on a test Discourse instance I have and is happening this week.
I tried all possible locations but to be honest, JS belongs just before the closing body tag not into the head, so that is where I would like it to go (and, that is what worked just last week)
It just pops up a 403 error modal, that’s it.
I made sure this is not due to components or theme… but not sure if it is due to some setting I inadvertently changed?