That is a surprising failure for hickory. I had two hickory bows fail in compression this year, both of which did fine in central Alaska and the Mojave Desert, but didn't do as well in the upstate NY sogginess. One was just a couple weeks back, when I strung my 80# bow for the first time since mid-winter, and it just felt mushy. Then I saw the frets in the lower limb, which had also taken another inch of string follow. Had it in my garage for the winter, and didn't take it in when the rainy weather started. For hickory to fail in tension, it seems like there had to be a rot issue of some sort. Generally, you want the back crowned and the belly flat to avoid compression failure, and nobody worries about tension failure, even with major grain violation. Odd.