Basically anything that’s watery-ish is fine because it will boil and separate the particles evenly (particles move easier through water than almost any liquid besides some special chemicals iirc) but cream soup is much thicker and has taken up a lot of the potential for free-moving particulate.
Same goes for anything else. If you can see the water move and behave like water, it should boil and disperse the cubes. Anything that behaves thicker than water risks the cubes not dispersing properly so you risk unexpected salty bites.