Hey there @Nestor,
It does indeed work as @Natjur stated, it is per refinement process as opposed to per material.
If you're not seeing an increase in the counter, we'd like to ask if you're running any add ons. If so, please disable them and let us know if it helps. If not, we'll be happy to take a closer look!
Ourorboros wrote: »Unless you have run into a new bug, you need to 'refresh' the data. Try /reloadui, relog, etc.