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It stalled because the temperature of the compressed air was not high enough to ignite the injected fuel. A cold prechamber engine has a lot of surface area internally to dissipate the heat made by compression. Once the heat soaks into the block, no more auto-ignition.
That's why afterglow is a thing. Even if the air gets colder than needed, the glow plug tip is extremely hot and it provides a point of ignition. With afterglow enabled on my 190D, the OM601 idles perfectly down into the teens F.
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