A Statistical/Design anomaly? Microwave ovens with a turntable,?

This phenomenon was studied by that great Irish physicist Murphy.

Now you would also notice that you can be inside all morning but the instant you go outside for something the phone rings.

Or you get into the shower and the phone rings so you leap out wet and naked to get the phone and THAT is the exact moment that someone knocks on the door.

There are many other situations but they can always be summarized as "When any occurrence happens at random it will always end up creating the least convenient outcome and that at the least convenient time."

It is known as "Murphy's Law".

I don't know the answer to your predicament but I do know if food spills over onto the turntable you should lap it off rather than waste it . There is knife and fork food , finger food and lapping food . Turntable food would be under the lapping category .

And how many of the hundreds of millions of microwave ovens produced / in use have you examined ? Have you noted which brands / models / styles have this feature ? Your sample is miniscule to non-existent, and your experimental procedure leaves much to be desired. So your conclusion is wrong with a certainty approaching 100%.