The field extraData is 278 bytes, but should be 32. It is quite likely that you are connected to a POA chain.

[bh717]

The field extraData is 278 bytes, but should be 32. It is quite likely that you are connected to a POA chain.

[fselmo]

I can't reproduce this. I see the same problem was asked on Discord and others can't reproduce as well. Discord is a good place to keep your conversation going. If this issue persists, don't hesitate to ask to re-open.

In [1]: from web3 import Web3
   ...: from web3.middleware import ExtraDataToPOAMiddleware
   ...: 
   ...: w3 = Web3(Web3.HTTPProvider('https://bsc-testnet-rpc.publicnode.com'))
   ...: w3.middleware_onion.inject(ExtraDataToPOAMiddleware, layer=0)

In [2]: w3.eth.block_number
Out[2]: 43349001

In [3]: latest_block = w3.eth.get_block('latest')
   ...: base_fee = latest_block['baseFeePerGas']
   ...: w3.eth.max_priority_fee
Out[3]: 5000000000