I work in an enterprise related to the development of electronics and all kinds of spacecraft for space needs. The boss told the story. They built an antenna. We were lucky at the test. Before this, there was a check, type of weight, dimensions, numbers, etc. And on the tests themselves found out that something was wrong and the problem in the software. brought back for repair. When tested the second time it turned out that the device weighs 1.5 kg more than before. A representative of our department had to twist for a long time, imagining that the programmers wrote the code for one and a half kilograms. The device was taken, but where the extra kilos came from so nobody understood)