Trucks continue to send resources to full great works site

[AusQB 2]

I recently filled up the alloy portion of the space center, but the trucks keep stealing the alloy from my depot and taking it to the site anyway. I'm trying to stock it up to send to another city so I have it set to local, but the game still thinks it's meant to be used.

 

I tried bulldozing and replacing the depot, but it does nothing. The issue is at the site, the "send resources" state is locked in and doesn't get disabled when it's full. I had to resort to setting to export and quickly gifting the alloy ten tons at a time whenever I could.

 

Is there any possible way around this?