Can't upgrade to premium stash tab

I buy two upgrade to premium stash tab
and it didn't work, my normal stash tab is not upgraded to premium

Noticed the same issue, did 5 tabs and don't see any change.

Same

Bumping this. Bought 2 premium stash upgrades and don't see any existing tabs changed. Can check if it's a bug or provide a guide on how to activate or something? Thanks.

update: logged out for lunch. logged back in a couple of hours later and it's updated.

An existing tab will be converted to premium, seems like a slight delay before this is reflected.

The tabs are upgraded instantly. They DO become premium and you can use all the premium tab functionality. The issue is the color of the tab stays grey and doesn't change even if you change it manually. It's just a display issue and it starts to work properly only after relogging.