Auto Key = Frame 0 Doesn't Correctly Adapt to 24fps Mode
If you set the preference for Auto Keying to be at Frame 1, then change your frame rate from the default 30fps to 24fps, the auto keyframing will happen at 0:160 (in ticks). This is a big issue if you want to have your default auto keys to be set to 1, but most often work at 24fps or have a Maxstart scene at 24fps that loads on startup.
In order for the auto keyframing to happen correctly on frame 1 again you must change the setting AFTER changing frame rates. The setting in preferences needs to be aware of frame rate changes and adapt accordingly so you don't end up with all your auto keys on in-between frame ticks.
I've reported it multiple times over the years.
AdminMartin B (Admin, Autodesk) commented
Sounds like a bug worth reporting?