I thought iPhone 11 is waterproof?

The iPhone 11 is water resistant. It is IP68 rated (can withstand a maximum depth of 4 meters up to 30 minutes).

Your iPhone should be fine but ensure not to charge it using the lighting port if you still believe it's wet. Let it dry first.

No this shouldn't happen. Turn your device off and book an appointment at your nearest Apple retail store.

Note: liquid damage is not covered under warranty

No iPhone has ever been made waterproof.

It may never work properly again.

That is just the beginning.