TSender

The flaw lies in the assumption that a failed transfer within the loop won't affect the addedAmount variable.

Here's a breakdown of the issue:

Incomplete addedAmount Update:

The code updates addedAmount only after a successful transfer: addedAmount := add(addedAmount, mload(0x24)).
If a transfer fails (causing a revert within the loop), the addedAmount wouldn't be incremented for that specific recipient.

Mismatched Totals:
In case of a failed transfer, the totalAmount might not be fully distributed, leading to a mismatch between the intended and actual transferred amounts.
The final check if iszero(eq(addedAmount, totalAmount)) might still pass even if some transfers failed, as addedAmount wouldn't reflect the missing transfers.

Consequences:

The airdrop might not distribute the intended total amount if some transfers fail.
The final check wouldn't accurately reflect the actual transferred amount, potentially masking issues during the airdrop process.