Issue description
Vehicles give up path finding when encountering a closed train crossing.
Even if the vehicle is paused and unpaused they will not see other crossings nearby leading to their destination.
It appears that vehicles will pathfind to an already closed crossing when other crossings are available.
Reproduction steps
See savefile for examples
Game version and build number
v0.7.9 b495
Operating system
Windows
Attachments
save https://gofile.io/d/6gF5B4
Check the crossings at the copper ore offload, and the crossings at the iron ore load.
