Trucks not dumping products when there is a clear path to a dumping zone

Issue description

having issues with trucks not dumping products IE rock, dirt, waste in the dumping zone. stating no available place to dump product. they will even drive all way out to the area and then signal no place to dump and drive all the way back to the mine control tower, or back to the loose storage from the separator.
the ore sorter is set to reject single product loads.

Reproduction steps

1. assign a dumping zone
2. have multiple vehicles going to that zone to dump from multiple areas

Game version and build number

v0.7.1a b413

Operating system

Windows

Attachments

25-05-17_11-13-autosave-paused.save

Сheck Vehicles management -> what can be dumped by trucks

Сheck Vehicles management -> what can be dumped by trucks

i made sure that wasn't the issue before posting this.
they will eventually go and dump. usually when you get about 10 trucks stacked up they will all go and rush over and dump all at once. like their path finding or decision on where to dump is conflicting because of the amount of trucks, even though before update 3 i've had 40 trucks all dumping in the same area no issues.
Edit: this is the only dumping zone i have as well. so there isn't a conflict of trying to decide where to go between 2 or 3 sites either

I observe the same issue. It seems the issue occours when multiple trucks want to dump stuff at the same location. After the first truck(s) have done their thing the others stop complaining and start dumping again.

They sometimes dump, sometimes not, but it's because there are multiple trucks that are trying to fill an almost finished designation. At that point they need to reserve a new designation (as the one they wanted to dump on got finished) but any other one is unfortunately already reserved by other trucks that are on their way. Trying to dump at 2 designations with 26 trucks brings its problems :) One thing that could be improved here is for the trucks to avoid returning back to the mine tower or let the player to set it somehow.