I got some of these russian LM394 clones in, called AS394s. I didn't notice until moments ago that they have 8 leads instead of 6.
See datasheet. Pins 1 and 5 do nothing.
https://www.ericasynths.lv/media/as394ch.pdf
So why even manufacture them with 8 leads when every other equivalent of this device has SIX leads? Makes extra work. Poor saps like me gotta clip leads off.