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I noticed exactly the same thing on a new Mac mini M2 base model when I conncted the power cord. Now I'm relieved that it seems to be a common problem.

I don't know anything about electronics. Do you think this is some kind of defect or bad design of the power supply?

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Apple is very generous on input capacitors for their power supplies. It's usually a sign a good design as it's one of the first places companies skimp; and ensures that even dirty wall power or highly spiky load will not trip the PSU and keep the computer fed. However, it is widely recognized that Apple overdid it on apple silicon macs. Like, they really should have skimped a bit on that one. (we have racks full of M1s at work, and boy powering the rack on is a pain due to the inrush)

Using too large input filtering capacitors without a soft-start circuit is a sign of very poor circuit design.

What size are the capacitors?

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