Hi, Josh.
I was able to replicate this console warning message and reported the bug to our developers. I’m unsure what’s causing it, but it’s a console warning, not a console error (so it’s less bad).
However, I wasn’t able to reproduce the part of your issue that has the events out of order. Additionally, I noticed the browser tab <title> changes to “untitled” after clicking Back. This also didn’t happen on my testing site.
For the console warning part of this thread, I’ll mark this ticket as Pending Fix, which means this thread should receive a reply once the applicable fix has been released. I cannot guarantee when it will be fixed as it’s in the development team’s hands now. They need to assign it, code it, test it, and schedule it for release.
I apologize for this issue and appreciate your understanding and patience.