Sepolia Error Connection

[EgoInc]

Hello, I've previously created an issue https://github.com/orgs/WalletConnect/discussions/3369 about problems with connection to Sepolia Test Network

In a few words:
I'm trying to migrate from web3-provider to ethereum-provider

My code

for authorization page:

export const provider = await EthereumProvider.init({
        projectId: 'PROJ-ID',
        chains: [11155511],
        showQrModal: true
 })

.....

await provider.connect();

at the page with smart-contract interaction:

 import {provider} from ...

//Connect to ethers
await provider.enable();
lib = new ethers.providers.Web3Provider(provider);

//Connect to 
var contractERC1155 = new ethers.Contract(contract, configErc1155, lib.getSigner());
var approval = await contractERC1155.isApprovedForAll(loggedUser, TraderAddress)

So the problem is: When I use Sepolia network (11155111) - interaction with smart contract throw such error:

Failed to load resource:  https://rpc.walletconnect.com/v1?chainId=eip155:11155111&projectId={_here is my project id_} the server responded with a status of 400 (Bad Request)

However when I changed network to Mumbai (80001) - the code starts working without any problems. So what's the problem with Sepolia network?

@glitch-txs asked to create issue in monorepo, so I am here with my problem
Thanks in advance =)