fonsinchen opened the ticket and wrote:

When stopping at a depot and then being manually restarted vehicles will create links in the link graph between their last stop before the depot and the next stop after it. The order prediction algorithm, however, assumes that stopping in a depot means the vehicle probably won't reach the next stop after the depot any time soon and consequently the loading algorithm won't load any cargo waiting for the link onto the vehicle.

There are two ways of solving this:

1. As implemented in ulfhermann/openttd@7782bdf, just invalidate the last_loading_station when stopping in a depot. That will prevent the creation of the link.
2. Ignore the "stop" attribute when predicting the next hop and do load cargo onto the vehicle. krinn favours this solution, as stated in # openttd on July 22nd 2013.

See also http://www.tt-forums.net/viewtopic.php?f=31&t=67085 for a save game and explanation.

Reported version: trunk
Operating system: All

This issue was imported from FlySpray: https://bugs.openttd.org/task/5672