CBEthCollateral and AnkrStakedEthCollateral _underlyingRefPerTok is incorrect

Lines of code Vulnerability details The CBEthCollateral.underlyingRefPerTok function just uses CBEth.exchangeRate to get the ref/tok rate. The CBEth.exchangeRate can only get the conversion rate from cbETH to staked ETH2 on the coinbase. However as the docs...