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Either side couldve moved since the crank wasnt locked....or both moved....it's the pressure from the valve springs which force the cams to turn along with tension from the chain tensioners.
also they could've moved backward.....you just don't know....
the tolerances are simply too tight and once the cams get out of time something hits.

Pull all the cams.....then do a leakdown test on each cylinder....
it's the only way you're going to know if you have bent valves, you may get lucky, but it'll depend on the force they hit.