Sending image data through SyncVar doesn't work (Mirror Networking)

Question

When SetTexture is run on the host it displays the sprite and works correctly, however on the client it displays this error:

SetPixels32 called with invalid number of pixels in the array UnityEngine.Texture2D:SetPixels32 (UnityEngine.Color32[])
Mirror.NetworkReaderExtensions:ReadTexture2D (Mirror.NetworkReader) (at Assets/Mirror/Runtime/NetworkReaderExtensions.cs:343)
Player:DeserializeSyncVars (Mirror.NetworkReader,bool)
Mirror.NetworkBehaviour:OnDeserialize (Mirror.NetworkReader,bool) (at Assets/Mirror/Runtime/NetworkBehaviour.cs:979)
Mirror.NetworkIdentity:OnDeserializeSafely (Mirror.NetworkBehaviour,Mirror.NetworkReader,bool) (at Assets/Mirror/Runtime/NetworkIdentity.cs:1022)

(And more but I think the more important thing in the error is the first line)

This is the code: basically users can choose an image of their computer, which is stored in the networkManager.clientProfile variable. The image is sent to the server, and the texture variable changes, so the hook code should change the sprite for all clients.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using Mirror;

public class Player : NetworkBehaviour
{
    [HideInInspector] 
    public SpriteRenderer spriteRenderer;

    [SyncVar(hook = nameof(SetTexture))] 
    Texture2D textureSprite;

    void SetTexture(Texture2D oldTexture, Texture2D newTexture)
    {
        Sprite newSprite = Sprite.Create(newTexture, new Rect(0, 0, newTexture.width, newTexture.height), new Vector2(0.5f, 0.5f), 256);
        spriteRenderer.sprite = newSprite;
    }

    public override void OnStartClient()
    {
        base.OnStartClient();

        // networkManager.clientProfile is a Texture2D stored locally
        CmdSetSprite(networkManager.clientProfile.EncodeToPNG());
    }

    [Command]
    void CmdSetSprite(byte[] bytes)
    {
        if (bytes != null)
        {
            Texture2D tex = new Texture2D(5, 5);
            tex.LoadImage(bytes);

            textureSprite = tex;
        }
    }
}