I can put 2 points 3 feet from each other and it will route them around a 2 mile detour randomly

I had that happen to me with Google Maps walking directions recently. I worked out pretty confidently that the reason was because Google thought it was a one-way path, because the detour would stop happening if I swapped the start and end locations.

My go-to is Ride With GPS. It gives you the ability to do manual routing if you want it, and frankly I usually do use that, but its defaults are a lot better than Google.

To be honest, I find Google Maps pretty poor for cycling even in Australia. For some of the same reasons they’re bad in the Netherlands. A high tendency to send you on busier roads (though here that means actually dangerous, rather than just a bit uncomfortable and noisy), and not really understanding the difference between an on-road bike lane, a dedicated bike path, and a quieter bike-friendly street.