Naw, its a known thing. There's an even better version of this trick that leads to a ~20 second fight, but it might be PS2 version exclusive. As far as I know, these happenings are purely luck. Here are some youtube links:
TSC Egg Beetle Ranking: https://www.soniccenter.org/rankings/sonic_unleashed_wii-ps2/bosses/egg_beetle
20 second fight: http://www.youtube.com/watch?v=znTRiNk36gE

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I think Joeey may have faked their Egg Beetle Speedrun.

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