Deposits in the AfEth contract are split based on a configured ratio. One portion of the split goes to SafEth, while the other is deposited in the Votium strategy.
https://github.com/code-423n4/2023-09-asymmetry/blob/main/contracts/AfEth.sol#L148-L169
The amounts that go into each are calculated in lines 156 and 160. Both sValue and vValue calculations could be rounded down to zero if the numerator is lower than the denominator.
Even with a low ratio value, the amounts lost are negligible, hence the low severity.
For example, given a small ratio of 1% (i.e. 1e16) we have:
Amount should be lower than 100 wei in order to be rounded down to zero.
