Can Issuers combine multiple credentials into one single credential?

From the issuer side, there is only one credential and one credential can contain multiple fields (not limited at all) in the previous release were limited but with the new one there are not. From the verifier side, you can only generate one proof at a time, but the verifier can set up a mechanism to concatenate/associate with other proofs. You need to do one query for every proof (one query, one proof). It is not possible to verify two credentials at the same time with one proof.