>>8571499>I wonder if that is a legal connection as I also put studs into technic holesIt's legal to put a single stud into a technic hole, but it's not legal to put more than one stud into adjacent technic holes.
For example, it would be illegal to put the studs of a 1x2 plate into the holes of a single Technic piece. This is because Technic holes are slightly more narrow than System antistuds, so it creates an unacceptable amount of stress on the parts.