Problem

After registering a IdentityCredential, asking the contract whether that member is registered returns "no".

To reproduce

It's easier to understand by having a look at the test case tests/node/test_wakunode_relay_rln:664, named "Key Management and Integrity".
In the lines 690 and 691, two IdentityCredentials are successfully registered. Later, on lines 719 to 722, there are two sets of different calls to memberExists. The difference lies in the way the contract objets are retrieved, but they should be equivalent. All those 4 calls return a 0, meaning no member was found.

Expected behavior

The calls to memberExists should return the idCommiment.

nwaku version/commit hash

• wakunode: v0.28.0-29-g5c645c
• Git: e28ae68
• PR: test(rln): Implement rln tests #2639