Seems I lose rebirth, space, and radiation progress, but nothing else that I've noticed. I may have gained the ability to auto add to the tree unless the bug coincided with me unlocking the feature. Either way, I have it now and did not before.
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.