It seems that FS2024 SimUpdate 1 Beta (currently 1.3.22.0) has literally “broken” the bridges (and not just these two) and replaced one of them with a generic model. I created a bug report here: World photographer FS2024: Several POI 3D models missing in game (SU 1 beta regression).
I mention this in this thread just in case someone else with the SU 1 beta build tries to do this mission, comes here and is irritated like me.