When you get all the transmogs from a token, in the Siege of Orgrimmar mini-list, the Essence shows 0/4 instead of 1/5.

I don't know if it's meant to be like this, but since this is the first time I've seen something like this... here it is.

I believe this is the effect of the logic working correctly. These tokens only show up because they're considered 'collectible' in that they are used to then obtain something else 'collectible'. Once there's nothing 'collectible' to be obtained with the token, the token itself also no longer is considered 'collectible'. Thus the Essence then only has 4 possible 'collectible' Tokens to purchase due their their inherited collectibility.

Edit: Though some recent 'filling' logic for minilists was improved and this led to the slight change in visibility in this situation.

tl;dr: Working fine, thanks for checking.