Has anyone else noticed that not all bottled beers have the same amount of beer in the bottle?

I’m talking about beers that are marketed as six-packs of 12-oz beer. I have not yet actually started tracking which beer brands tent to have more but I think I should. I noticed because I always use the same kind of beer goblets and sometimes they are filled to near the brim and sometimes only to an inch or more below it. I would have thought this to be more scientifically measured, at the very least not to affect the profit margin.

I guess the next Q would be: are any of the beers in the glass UNDER 12 oz or are the variants OVER 12 oz? If under, I guess I could complain. If consistently over, maybe I should buy more of that beer.