Unfortunately is has stopped leaking for now. I say unfortunately, because I don’t know when it may start again. It seemed to start to leak when I pulled out the dishwasher, so movement/flexing/etc made it happen. I was unable to determine exactly where it leaked from, but it seemed to pool near the center of the entire valve, so it could have been near the crimped area or the knob area, or maybe even the connection going off to the dishwasher, and the water could have just run down to the lowest bit of the valve.
It’s 1/2" nominal PEX going to a quarter-turn shutoff, to a 3/8 braided dishwasher line. I just didn’t know what to call the weird crimped/connector part on the PEX, and thus how to properly remove it if necessary. All of the PEX crimps that I’ve found online have been very different looking.