That's where the whole thing falls apart with these things usually. Oscillators are quite difficult to simulate because they require less than ideal startup con

That's where the whole thing falls apart with these things usually. Oscillators are quite difficult to simulate because they require less than ideal startup conditions i.e. noise, voltage gradients to get going. While the SPICE engine underneath does support that, you can't really expect someone wiring up a breadboard to be completely aware of the nuances around simulation vs reality. This got to a point that Bob Pease of legendary analogue design fame, chucked a computer off a roof https://www.youtube.com/watch?v=vrZ_fMqd8k8 https://www.youtube.com/watch?v=vrZ_fMqd8k8