Comment by numpad0

Ports develop rust if exposed to elements. This applies to USB-C ports too. That's why all seriously rugged phones has flaps for every ports with all-plastic enclosures over metal frames(not all waterproof equipment are seawater rated; they have to be specifically designed and tested to be resistant to galvanic corrosion if the water to be submerged in is not deionized or at least potable).

Urban rainproof phones like S24 and iPhone aren't actually intended to be left drenched in mud or seawater, so they don't have to be equipped to be resistant against pieces of soil or soaked driftwood jammed in the charge port.