For Russia to admit that Ukrainians managed, at 150+ miles or so (I think) to hit one (or two) of the bridge supports is a big embarrassment. That is why they are not specifying a cause.
perhaps, but the railway traffic has resume. this bridge is probably most hated but now it is less significant because the Russians control all south of Dnipro river, not the only access route anymore.
https://liveuamap.com/en/2023/17-july-railway-traffic-towards-the-crimean-bridge-resumed