Polygon Scan doesn't recognize ERC721 token made with OZ Wizard

Hi everybody!

I have some trouble with the verification of a ERC721 made with the Wizard tool.

I successfully verified the contract as you can see at this link on mumbai testnet.

But this contract isn't recognized as NFT by polygonscan, and I can't easily check useful informations like holders.

These are my wizard settings:

and this the resulting code:

:1234: Code to reproduce

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

import "@openzeppelin/contracts@4.9.2/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts@4.9.2/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts@4.9.2/access/Ownable.sol";
import "@openzeppelin/contracts@4.9.2/utils/Counters.sol";

contract MyToken is ERC721, ERC721URIStorage, Ownable {
    using Counters for Counters.Counter;

    Counters.Counter private _tokenIdCounter;

    constructor() ERC721("MyToken", "MTK") {}

    function _baseURI() internal pure override returns (string memory) {
        return "ipfs://";

    function safeMint(address to, string memory uri) public onlyOwner {
        uint256 tokenId = _tokenIdCounter.current();
        _safeMint(to, tokenId);
        _setTokenURI(tokenId, uri);

    // The following functions are overrides required by Solidity.

    function _burn(uint256 tokenId) internal override(ERC721, ERC721URIStorage) {

    function tokenURI(uint256 tokenId)
        override(ERC721, ERC721URIStorage)
        returns (string memory)
        return super.tokenURI(tokenId);

    function supportsInterface(bytes4 interfaceId)
        override(ERC721, ERC721URIStorage)
        returns (bool)
        return super.supportsInterface(interfaceId);

:computer: Environment

Truffle v5.6.3 (core: 5.6.3)
Ganache v7.4.4
Solidity - 0.8.17 (solc-js)
Node v18.6.0
Web3.js v1.7.4

Now it's recognized as ERC721, probably there is some delay between submission and the indexing.