Validator commission rates before epoch 202

I am trying to see if there's a way to get the commission rates of a validator before epoch 202. I'm wondering if this calculation was added in a release around this time.

The odd thing if it was a release is that epoch 201 gives null for commission, epoch 202 gives a value, then epoch 203 gives null again. 204+ all give the correct value for commission.

Example RPC call to getInflationReward on an old validator that was alive pre-epoch 202.

curl --location 'https://api.mainnet-beta.solana.com' --header 'Content-Type: application/json' --data '{"jsonrpc": "2.0","id": 1,"method": "getInflationReward","params": [        ["beefKGBWeSpHzYBHZXwp5So7wdQGX6mu4ZHCsH3uTar"        ],        {"epoch": 201        }    ]}'  | jq

Commission is null :

{"jsonrpc": "2.0","result": [    {"amount": 461280375727,"commission": null,"effectiveSlot": 87264000,"epoch": 201,"postBalance": 2303678884416    }  ],"id": 1}