'Etherscan fetching wrong parameter name in input data information table?

The information table (bottom of a tx page) in Etherscan shows one of the parameters' name of a function call is "_foo", while I cannot find any reference anywhere in the codebase (including JSON ABIs, events) to a parameters called "_foo".

How is this possible? Where does Etherscan fetch the name of these parameters from?

solidity etherscan

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'Etherscan fetching wrong parameter name in input data information table?

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