Error 2025 $2 Dollars Toonie Coin?

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A toonie, like any other bimetallic coin, is made of two different metals, in this case aluminium-bronze (core) and stainless steel (ring). So they will have different expansion coefficients. I'm not entirely sure which one of those two alloys is going to expand more when heated; if steel has a higher expansion coefficient, then all you have to do to get the two pieces of the coin to fall apart, is to heat it up, since the ring will expand more than the core. If it's the core that has the higher expansion coefficient, then the oposite is true, and all you have to do is cool it down.