Goroutines finish before expected despite using sync.WaitGroup

package main

import (
	"fmt"
	"sync"
)

func processTask(task string, wg *sync.WaitGroup) string {
	defer wg.Done()	// Simulate processing
	return "Processed " + task
}

func processTasks(tasks []string) []string {
	var wg sync.WaitGroup
	results := make([]string, len(tasks))
	for i, task := range tasks {
		go func(i int, task string) {
			wg.Add(1)		// Incorrect placement
			results[i] = processTask(task, &wg)
		}(i, task)
	}
	wg.Wait()
	return results
}

func main() {
	tasks := []string{"task1", "task2"}
	results := processTasks(tasks)
	fmt.Println(results)
}