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Dave Martindale

writes:

That type is a syncro-timer motor. There is a cog or detent that gets
sticky or worn that allows it to run in the opposite direction.
When it starts in the direction that is not desired...it hits the arm
or cog...and bounces back to the correct direction.

Microwave oven turntable drive motors are also synchronous motors which
run in either direction. But the oven doesn't care which direction the
turntable goes, so the motor doesn't need the reversing mechanism.
Sometimes the turntable goes one way, sometimes it turns the other way.

Dave