The link below is a report on a control bar/keel junction failure on a Wills Wing Sport 3 (posted on OZ report). I don't believe this failure occurred without a substantial event having contributed to the failure. That said, I suggest it would be very important to inspect this area for any indication of cracks or fatigue. Also, any other model with a similar design should also be inspected.
https://ozreport.com/26.83#1
Fly Safe,
Martin Henry