Premium tab upgrade to Merchant tab?

At the start of early access I upgraded one of starting stash tabs to a premium tab. Now with merchant tabs I was fully hoping to convert that to a merchant tab. So I go to convert it and see that upgraded tabs are "currently unable" to be converted. Ok I guess I'll wait until it is. Fast forward to now they changed the wording to "unable to be used on upgrades to the initial four Stash Tabs"... Are you kidding me? So I'm forced to buy a merchant tab just to be able to sell stuff with the new trade system or be inconvenienced with the old trade system. Great... thanks GGG...