I think the reason the simple past of "melt" is never spelt "melt" is because it is pronounced with two syllables. I don't think in general that verbs ending in "t" usually have the same form in the present and the past. I note the American use of "fit" as a past as well as a present, but that would be incorrect in England, where the past is always "fitted". As well as the examples given, the verb "lean" has a past "leant", which is pronounced "lent".
That reminds me of a common misspelling I see on the internet: "lead" instead of "led" as the past of "lead". Probably a confusion with the metal.
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