2015 6.4 miss

Well a little update and I am a bit baffled. I thought like hellrats that I would find the cam lobe and lifter for that cylinder wiped. Lifter looks great with no play and bore scope shows the cam looking great also. I have all the parts already ( cam, lifters exct) so it will get all new but would like to hear some thoughts on what may have caused to pushrod to lose its tip
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