Canonet advance lock defunct

I just bought a Canonet QL17 (not G-III) and got it in the mail last week. I haven't had a chance to shoot any film through it yet, but I noticed some strangeness..

On my other QL17, you close the back and the film counter is on "S." You cock the advance four times to get to frame one. At that point the advance locks into place until the shutter is fired.

On this new Canonet, that never happens. It'll advance til the end of the roll if you keep cocking it. I usually carry the camera with my thumb under the advance, so that's a problem. Further, I'm sure I'll end up with a lot of blank frames when I accidently advance twice.


I'm assuming this is not normal, correct? Are there any obvious problems this could be stemming from? I removed the top plate and can't see anything that sticks out like a sore thumb, so that's the extent of my repair knowledge.

Thanks!