So as a Sitter I don't have permission to use gold features on the account I sit and finishing building/resource field upgrades is a gold feature. However, we all know that if an upgrade takes at the most 4m59s, you can finish the upgrade for free.
However as a Sitter you still can not. I think this is pretty weird and shouldn't be the case as it does not require any gold to do so.
I think it should be updated so a Sitter could finish such an upgrade.