Big Breakfast / sausage McMuffin

When did McDonalds change the eggs in the Big Breakfast? As a youth, the breakfast choices were Egg McMuffin, pancakes, or the Big Breakfast. I didn’t like the formed egg or the ham in the Egg McMuffin so I would often get the Big Breakfast and then make a sandwich out of the scrambled eggs, sausage patty, and English muffins. It lacked the cheese but in my mind was far superior to the Egg McMuffin. Later, the Sausage McMuffin was added but it lacked the egg part until the Sausage McMuffin with Egg became available.
Granted, I haven’t often ordered breakfast from McDonalds in the last few years but did have the occasion to pick up a few over this last summer before work. One on of my last times, I had a taste for a Big Breakfast-made Sausage ‘n Egg McMuffin. To my surprise, when opening the package, instead of the mass of scrambled eggs, I found two folded scrambled egg squares. I guess they are the ones from the other breakfast sandwiches but it was a bit of a shock to me. I haven’t had a chance to try again to see if it was an aberration or a new paradigm.