Unconsistent Go error return using if-construction with cypher/aes

I'm seeing strange behaviour where I should get an error back from a function, but I get nil instead.

The following code block contains 2 encrypt functions using cypher/aes. The only difference is the first 1/2 lines of each function. In encrypt2, I've combined the assignment of the first line of encrypt1 into the conditional.

package main

import (
    "crypto/aes"
    "crypto/cipher"
    "crypto/rand"
    "fmt"
    "io"
)

func main() {
    invalidKey := []byte("TCbKgXZsT")
    plaintext := []byte("dummycontenttoenctrypt")
    fmt.Println(encrypt1(plaintext, invalidKey))
    fmt.Println(encrypt2(plaintext, invalidKey))
}

func encrypt1(plaintext []byte, key []byte) (encrypted []byte, err error) {
    c, err := aes.NewCipher(key)
    if err == nil {
        if gcm, err := cipher.NewGCM(c); err == nil {
            nonce := make([]byte, gcm.NonceSize())
            if _, err = io.ReadFull(rand.Reader, nonce); err == nil {
                return gcm.Seal(nonce, nonce, plaintext, nil), nil
            }
        }
    }
    return nil, err
}

func encrypt2(plaintext []byte, key []byte) (encrypted []byte, err error) {
    if c, err := aes.NewCipher(key); err == nil {
        if gcm, err := cipher.NewGCM(c); err == nil {
            nonce := make([]byte, gcm.NonceSize())
            if _, err = io.ReadFull(rand.Reader, nonce); err == nil {
                return gcm.Seal(nonce, nonce, plaintext, nil), nil
            }
        }
    }
    return nil, err
}

Go Playground Link

I expected the same behaviour from these functions, as the logic is the same. However, calling encrypt1 returns an error (correct), while encrypt2 does not return the error (returns just nil).

I have used named arguments, so err is declared at the start of the function and should be populated by the first error in both functions.

Anything I'm doing wrong here?