Pokemon GO - rare spawning nests now randomized

Looks like another big change has been made to Pokemon GO. Spawning nests now seem to be completely randomized. Prior to this change, players could visit a spawning nest and know exactly what to expect from now. Now that's not the case at all. For example, what used to be a Charmander nest now spawns Abras, Digletts, Ponytas, Squirtles or others, depending on where you are. Same for an Electabuzz nest, which can now spawn Nidoran, Onix, Pinsir, Polywag, Cubone and more. It seems that “staples” of your area will always stay the same, but rare Pokemon are totally randomized.