I concur; lower temperature means any liquid becomes saturated with less dissolved solid. Agitation, or stirring, will mitigate the sugar falling out of solution.
It's Iced coffee so sugar doesn't dissolve like it does in hot coffee. Just swirl the cup around and around to mix it better.
It will be sugar in it but you really can't taste it the sugar will be in the bottom of your cup
Ask for liquid sugar
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