Re: Why has this not been fixed
I wrote about the Cuban pesos thing several years ago. I just edited the default dictionary with "cup" (no quotes) with "Cup" (also no quotes) and that fixes that.
I'd imagine substituting "mp3" with "M P 3" making sure the match is case insensitive would do the trick for that one.
Brian - Windows 10 Pro, 64-Bit, Version 1909, Build 18363
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