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Why do I turn into super Mario instead of fire Mario when I touch a fire flower AS SMALL Mario in Super Mario Bros 1?

I noticed one time when I was playing Super Mario Bros 1, I hit a block containing a fire flower, but then got hit, and yet the fire flower is still on-screen. When I touched the fire flower, as Small Mario, it just turned me into plain Super Mario instead of Fire Mario. Is this a bug? Or is it normal?