When a batch of credential is required, there's nothing in https://openid.net/specs/openid-4-verifiable-credential-issuance-1_0.html#section-8.3-6.1.1 that says the credentials must be returned in the same order the proofs were passed, so the issuer can use any keys from the list in any order so longer as it never uses one more than once.
It would probably be good to explicitly say this is the case so no wallet assumes the ordering is preserved.
When a batch of credential is required, there's nothing in https://openid.net/specs/openid-4-verifiable-credential-issuance-1_0.html#section-8.3-6.1.1 that says the credentials must be returned in the same order the proofs were passed, so the issuer can use any keys from the list in any order so longer as it never uses one more than once.
It would probably be good to explicitly say this is the case so no wallet assumes the ordering is preserved.