Found the crack at the spoke hole first,
I have a mate who owns a bike shop (mainly a repair service) who is one of the best wheel builders I've ever experienced. He hates those wheels & sees more cracks in that exact spot more times than you could imagine
Although to think they've survived this long racing/riding CX is definitely saying something about those wheels & how tough they really must be.
He services another mates bikes who is a very powerful sprinter (puts out over 1500 watts regularly) although his sprinting "style" or lack of it is like a rabid dog chasing you while wearing roller skates on an ice skating rink. He brakes everything especially rear wheels & frames.
Another pair of bikes (MTB) he regularly services from a hard core husband & wife pair are always almost completely destroyed. The wife's bike from endless km's & the husbands bike from sweat & corrosion. Quite commonly the brake pads are gone & it's only the metal on metal sound that alerts them the bike is due for some maintenance. Just 3 days ago I witnessed my mate trying to remove a set of lock-on mtb grips which he eventually hammered off after much unsuccessful yanking/pulling/twisting. Surprise surprise the little bolts had corroded & the alloy lock was ring eaten away & cracked
Between the pair of them I've not ever witnessed so many ruined bikes.
Gas propulsion.......it's natural don't fight it.