Concordium node version 5.4.2 is released for testnet.
We found a bug in node version 5.4.1, which was released for testnet on Thursday, June 1, 2023. The bug caused an extra byte to be added when running getModuleSource in the V1 GRPC API, which is fixed in version 5.4.2.
Updating to the newest node version is highly recommended.
The node release for mainnet is now planned for Wednesday, June 14.