We’ve released @openzeppelin/contracts@3.0.1 and @openzeppelin/contracts@2.5.1 with a small bug fix, which allowed for some internal functions in ERC777 to be called with the zero address as arguments, as reported in https://github.com/OpenZeppelin/openzeppelin-contracts/issues/2208 and addressed in https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2212 and https://github.com/OpenZeppelin/openzeppelin-contracts/pull/2213.
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