Weird. I've seen this happen before when you refresh while an interstitial is showing, but never spontaneously like this.

Removing security labels since going back doesn't really present a security risk to users. I'm going to lump this in to our interstitial refactor which we will hopefully be doing this quarter; not sure it makes sense to track this one down on its own.

Thanks for taking a look!

I wasn't sure if someone smarter than me could figure out a way to abuse this, so I took the cautious road and marked this as a security bug.

Note that while I understand there are some... quirks... with the way interstitials are rendered, this issue for me is particularly frustrating because it can take me several or a dozen of attempts to actually work around the interstitial because it disappears.

I don't know why or if this is specific to me, but I can reproduce it across three different Macs, albeit in very similar configurations.

I hope this helps with the priority of re-examining interstitials. In the mean time, I am working to remedy the need for the interstitial in the first place.