The ERC20MetaTxUpgradeable::transferWithAuthorization() and ERC20AdminUpgradeable::forceTransfer() functions bypasses zero address validation checks by directly calling ERC20Upgradeable::_update() instead of using ERC20Upgradeable::_transfer(), creating an inconsistency where transfers to address(0) are possible through these functions while being prevented in others like transfer() and transferFrom().
Here is the transferWithAuthorization() method:
Here is the forceTransfer() method:
The ERC20Upgradeable::transfer() and ERC20Upgradeable::transferFrom():
The ERC20Upgradeable::_transfer() method:
