If `ExtendedMarketHours` is set to True for a security and the algorithm places a trade during extended market hours, is the order filled at the closing price during the extended market hours or is the order converted to `MarketOnOpenOrder` to fill at the closing price after the market opens?

When I place a trade during extended market hours, it seems like the latter. If this is the case without configurable options, then trading during extended markt hours would not be supported right?

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