So in Proving Grounds, there are 3 generators that you have to disable. You have one block to do it. You're supposed to be able to only get 2 of them, then have to go up to the top to get a second block. It turns out though, that if you use one of the launchers and place your doggo just a little big in front of the launcher, then it's very easy to launch the block straight into the generator hanging at the top.

L = Launcher
D = Doggo
X = Center of 4 Launchers

X D L

If you do this before you go up and get the other block at the top (which triggers a save), then the platform in the room behind the cubey thing won't unlock, even after you go and get the other block. You're basically softlocked and have to restart the level.

I did this through on my first run through, so definitely possible to do so. Not like game ruining or anything, but in case anyone searches for this, I figured I'd let them know they're not alone.