Beta.10: `gas required exceeds allowance (0)`

[sander2]

I have beta.10 mostly working on a L2 testnet. It's working on accounts that have some Eth - the paymaster correctly ends up paying for the tx. However, when I try to submit a tx from an account that does not have any Eth, I get gas required exceeds allowance (0). This is using newEthersV5Provider fwiw.

Edit: I think this is a gas estimation problem. If I set an explicit gasLimit in the call, it does succeed. Can it be the case that some Eth is required for gas estimation to work?