I clicked to auto upgrade the 2nd ring (It was only around level 30, would have only gained a few levels), and it immediately reset my run to this state. I refreshed right after it happened, hoping it wasn't saved, but no luck.
I see now after having it happen a few times, but the reset doesn't appear to work properly since it doesn't reset my current level and I appear to be keeping my ascension points and mutagens on the reset. It didn't make a huge difference until my 3rd reset where I gained the ability to get multiple rebirth tiers at once. Since my level didn't reset, I was able to get rebirth T35 immediately.