Hello!
My experience with this bug.
Freighters cannot be used if the person selling the resource has less of the resource in the warehouse than the amount put on the market. If the buyer sets the market offer to 10 million, but you have 2 million, you will not be able to use freighters.
If the buyer reduces the market offer to 1 million, then you will be able to use freighters.
That's how it worked for me.
This allows me to use freighters in trade.
To be able to sell resources with freighters, you must always have more resources in the warehouse than the market offer.
These are my conclusions for this bug
