Refrigerators and freezers have always acted that way. Doesn’t need any kind of vacuum pump to pull a vacuum inside when trying to reopen the door soon after.
Warm air rushes in when you open the door, contracts because it’s cold in there and pulls a natural vacuum inside.
Some variations…a new or very good older gasket will seal better and make the door harder to reopen than an old brittle or leaky gasket. There is almost always an outlet/ inlet for the vacuum through the drain system. Some are just open holes that let air pass easily. Some have water traps and some have mechanical “duck call” type things that let water out but close up to keep air from coming back in. Both water traps and duck calls tend to plug up with algae easily and tend to get thrown out by techs…the slight improvement in efficiency isn’t worth the nuisance service call for a plugged drain.
The worst as far as not being able to reopen the door are manual defrost freezers with no drain system at all. It is not just difficult but impossible to reopen the door until the pressure equalizes very slowly through the gasket.
I used to tell the little old ladies who were upset about reopening a new refrigerator door. (Of course their old fridge didn’t have that problem…because their old fridge had crappy brittle/torn gaskets…or missing duck calls and water traps.
"Just stick your little finger in enough to pry the gasket out a little…you will hear a woosh of air and you can easily open the door…or just wait a few minutes and you can easily open the door…or just wait a few years and it will have leaky gaskets and act just like your old refrig.