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If the configured token contract being used is a rebasing token that negatively rebases, the protocol can cause loss of funds to users. This is because when the overall balance of the contract decreases, the quantity being used for withdrawals on Line 424 is based on the time the the tokens were locked. Due to this, the user unlocking can receive more tokens than needed, causing loss to other users.
The blast docs here mention that the rebasing for ETH, WETH and USDB is increasing and never decreases. But if future tokens that rebase negatively exist, this issue exists.
