I transitioned over from hardware design long ago. We had a similar concept where the circuit would work, but only when an oscilloscope probe is attached at the right place..
Except even after 10 minutes staring at his circuit diagram, I can't see the "attach scope probe here" so I must have dreamed it.
Back in the day we would muse about selling a "scope probe emulator" device that had the same 10pf capacitance or so, but was much smaller than an actual oscilloscope and could therefore easily be incorporated into a production board. Of course now oscilloscopes are sufficiently small and cheap that you could simply use a real one.