verifier circuit vkey read / write not working

[jonathanpwang]

halo2-snark-aggregator/halo2-snark-aggregator-circuit/src/fs.rs

Line 132 in 7b9f418

VerifyingKey::<G1Affine>::read::<_, Halo2VerifierCircuit<'_, Bn256>>(

Does this need to be Halo2VerifierCircuits<'_, Bn256, N>?

Also, I think vkey read/write does not work right now (known halo2 issue): can you merge the following PR into your halo2_proofs repo to resolve this?
zcash/halo2#661

[OrestTa]

@HAOYUatHZ