export_contracts returns is_erc20=false, even though the contract is ERC-20

[0xAleksaOpacic]

Description:
I have deployed ERC-20 contract on the Polygon testnet (Mumbai)

While testing different commands, i have noticed that calling:
polygonetl export_contracts --contract-addresses contract_addresses.txt --provider-uri http://matic-mumbai.chainstacklabs.com --output contracts.csv

returns all contracts, but is_erc20 and is_erc721 fields are always FALSE

Enviroment:
PolygonEtl version: polygonetl, version 0.1.8
Network: Polygon Mumbai testnet
JSON-RPC: http://matic-mumbai.chainstacklabs.com
Chain id: 80001
Transaction hash: 0xb2b0a3a0c07dbf7be8d52f0cb3990bf5ef0088121bf23854ef6f1b7f6c80eac7
Contract Address: 0xCc5dDbAECDB40993d779b68b0CE503219aE5A144
Contract file: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol

Steps to reproduce:

1. polygonetl export_blocks_and_transactions --start-block 26347319 --end-block 26347321 --provider-uri http://matic-mumbai.chainstacklabs.com --blocks-output blocks.csv --transactions-output transactions.csv
2. polygonetl extract_csv_column --input transactions.csv --column hash --output transaction_hashes.txt
3. polygonetl export_receipts_and_logs --transaction-hashes transaction_hashes.txt --provider-uri http://matic-mumbai.chainstacklabs.com --receipts-output receipts.csv --logs-output logs.csv
4. polygonetl extract_token_transfers --logs logs.csv --output token_transfers.csv
5. polygonetl extract_csv_column --input receipts.csv --column contract_address --output contract_addresses.txt
6. polygonetl export_contracts --contract-addresses contract_addresses.txt --provider-uri http://matic-mumbai.chainstacklabs.com --output contracts.csv

Check contracts.csv file and for contract (addr = 0xcc5ddbaecdb40993d779b68b0ce503219ae5a144) is_erc20 and is_erc721 fields are always FALSE