I remember first noticing this kind of thing when I was a kid and I spent my allowance money on candy.
I bought 3-Musketeer Bars.
At that time, they folded the ends of the packing back against the candy bar.
It was ALL BAR. Life was good.
Then, WITHOUT TELLING ME IN ADVANCE, they made the bar smaller and left the “ears” of the package stick out on either side. The effect was that the bar LOOKED like the same size, but it wasn’t.
I distinctly remember that one week they were the old package and then the next week there was this “new” package that wasn’t quite right. The price was the same as the old bar.
“Those Motherfuckers” I remember saying when I realized what was going on.
I still bought it.