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RE: YOUR ENGINE IS NOT A STATE, BUT IT HAS A GOVERNOR(An insight into how engine speed is maintained)
With the absence of a governor, you would need to adjust the throttle manually each time your lawn mower ran across a dense patch of grass or the engine will stall. According to your post, the governor does the job for us by detecting changes in the load and adjusting the throttle to compensate, if I'm not mistaken @sogless
Without a governor or manual adjustment, the engine will try to compensate for the load by reducing the speed, this normallyresults in increased torque, however like you mentioned, if the patch is too dense in the absence of either governor or manual control, it will stall until you move it away from the patch and then it resumes work with a sharp increase in speed. The latter point however is the main reason why lawn mowers have governors, to ensure that no matter the reduction in load, it doesn't run above a certain speed limit.
Thanks for this ... Kudos