Glad to hear you're ok.
I climbed upper hitch today. First pitch to tree was brittle in spots and plastic. The final little vertical section to the gully was brittle like I can't remember. Huge fractures betore I'd get a decent stick but the ice wasn't really breaking away. I usually don't place gear here but it was so scetch I did. When I pulled up next to that little tree limb what I was standing on fractured and broke away. I didn't go anywhere as I had a good hook and turf shot and my feet actually didn't move much as was expecting this could happen.
If you weren't though I could see how a fall might happen. You're actually in pretty easy terrain at that point (edit to add) and probably not expecting anything to break away. Of course this is total speculation as ice could and probably was completely different.
Heal up and get back out there.