BUG - query kes-period-info causes a `Deserialise Failure / Size mismatch`

[gitmachtl]

CLI: cardano-cli 10.15
NODE: cardano-node 10.7.1
Network: Testnet
Era: conway
ProtocolVersion: 10

I generated the opcert for a new testnet pool:

{
    "type": "NodeOperationalCertificate",
    "description": "",
    "cborHex": "828458203a40b1b74fe206f7614ecb6d3a524b8d517ee66878f9900321106553ce6baea00109584067bedb04c7f020bddab3f7f200f3de51f1c46f54838097f6d273e19514b1fb17a8d175a905976c60ea69a78c3c7b43ca86ad76e70135c08059f35f4c34cd3e0c5820c3b17e60c9b1f4d504b731ca691f75e10832f6fff9b2739e2c98772cbe8e54a8"
}

When doing automated checks about the correct onchain kes period, cardano-cli 10.15 is failing with the following error:

./cardano-cli10.15 latest query kes-period-info --op-cert-file testpool.opcert

Command failed: query kes-period-info
Error: Failed to decode the protocol state: Deserialisation failure while decoding PraosState.
CBOR failed with error: DeserialiseFailure 3 "Size mismatch when decoding PraosState.\nExpected 7, but found 8."
CallStack (from HasCallStack):
  fromEitherCIOCli, called at src/Cardano/CLI/EraBased/Query/Run.hs:409:11 in cardano-cli-10.15.0.0-LxZdHGi1Udq6Fv4mxUbqfP:Cardano.CLI.EraBased.Query.Run
  runQueryKesPeriodInfoCmd, called at src/Cardano/CLI/EraBased/Query/Run.hs:113:37 in cardano-cli-10.15.0.0-LxZdHGi1Udq6Fv4mxUbqfP:Cardano.CLI.EraBased.Query.Run
  runQueryCmds, called at src/Cardano/CLI/EraBased/Run.hs:53:5 in cardano-cli-10.15.0.0-LxZdHGi1Udq6Fv4mxUbqfP:Cardano.CLI.EraBased.Run
  runCmds, called at src/Cardano/CLI/EraBased/Run.hs:35:35 in cardano-cli-10.15.0.0-LxZdHGi1Udq6Fv4mxUbqfP:Cardano.CLI.EraBased.Run
  runAnyEraCommand, called at src/Cardano/CLI/Run.hs:56:5 in cardano-cli-10.15.0.0-LxZdHGi1Udq6Fv4mxUbqfP:Cardano.CLI.Run
  runClientCommand, called at app/cardano-cli.hs:58:14 in cardano-cli-10.15.0.0-EjkBTQy2Hrc76heTLQ0mso-cardano-cli:Main

[gitmachtl]

I just checked, cardano-cli 10.16 does not show this issue. Please mark this as solved if its not a problem anymore, thx.