Internal error in plug-in 'Initializer' at initialize

[gitting-around]

When trying to generate a spec for 2 fmus connected to each other, 2 outputs go from fmu1 to fmu2, and two outputs go from fmu2 to fmu1, it gives the following error:

23:39:04.047 [main] ERROR org.intocps.maestro.MablSpecificationGenerator - Internal error in plug-in 'Initializer' at   initialize. Message: Internal error: 
Error 0999: Internal error in plug-in 'Initializer' at initialize. Message: Internal error:  'initialize' at 89:23
Error 0997: Unfold failure in plugin Initializer for initialize null
java.lang.RuntimeException: Expansion not possible type errors: Error 0999: Internal error in plug-in 'Initializer' at initialize.         Message: Internal error:  'initialize' at 89:23
Error 0997: Unfold failure in plugin Initializer for initialize null

at org.intocps.maestro.MablSpecificationGenerator.expandExternals(MablSpecificationGenerator.java:140)
at org.intocps.maestro.MablSpecificationGenerator.expandExternals(MablSpecificationGenerator.java:221)
at org.intocps.maestro.MablSpecificationGenerator.expandExternals(MablSpecificationGenerator.java:114)
at org.intocps.maestro.MablSpecificationGenerator.generateFromDocuments(MablSpecificationGenerator.java:401)
at org.intocps.maestro.Mabl.expand(Mabl.java:279)
at org.intocps.maestro.cli.MablCliUtil.expand(MablCliUtil.java:82)
at org.intocps.maestro.cli.ImportCmd.call(ImportCmd.java:167)
at org.intocps.maestro.cli.ImportCmd.call(ImportCmd.java:24)
at picocli.CommandLine.executeUserObject(CommandLine.java:1953)
at picocli.CommandLine.access$1300(CommandLine.java:145)
at picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2352)
at picocli.CommandLine$RunLast.handle(CommandLine.java:2346)
at picocli.CommandLine$RunLast.handle(CommandLine.java:2311)
at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2179)
at picocli.CommandLine.execute(CommandLine.java:2078)
at org.intocps.maestro.Main.main(Main.java:19)

The multimodel file looks like:

{
  "fmus": {
    "{pressurepipe}": "./pressure_pipe.fmu",
    "{rabbitmq}": "./rabbitmq.fmu"
  },
  "connections": {
    "{pressurepipe}.pressurepipeInstance.h2s": [
      "{rabbitmq}.rabbitmqInstance.h2s"
    ],
    "{pressurepipe}.pressurepipeInstance.h2s_timestamp": [
      "{rabbitmq}.rabbitmqInstance.h2s_timestamp"
    ],
    "{rabbitmq}.rabbitmqInstance.flow": [
      "{pressurepipe}.pressurepipeInstance.flow"
    ],
    "{rabbitmq}.rabbitmqInstance.flow_timestamp": [
      "{pressurepipe}.pressurepipeInstance.flow_timestamp"
    ]
  },
  "parameters": {
    "{rabbitmq}.rabbitmqInstance.config.hostname": "localhost",
    "{rabbitmq}.rabbitmqInstance.config.port": 5672,
    "{rabbitmq}.rabbitmqInstance.config.username": "guest",
    "{rabbitmq}.rabbitmqInstance.config.password": "guest",
    "{rabbitmq}.rabbitmqInstance.config.routingkey": "to_cosim",
    "{rabbitmq}.rabbitmqInstance.config.communicationtimeout": 60,
    "{rabbitmq}.rabbitmqInstance.config.precision": 10,
    "{rabbitmq}.rabbitmqInstance.config.maxage": 1000,
    "{rabbitmq}.rabbitmqInstance.config.lookahead": 1,
    "{rabbitmq}.rabbitmqInstance.config.exchangename": "dt",
    "{rabbitmq}.rabbitmqInstance.config.exchangetype": "direct",
    "{rabbitmq}.rabbitmqInstance.config.healthdata.exchangename": "fmi_digital_twin_sh",
    "{rabbitmq}.rabbitmqInstance.config.healthdata.exchangetype": "direct",
    "{rabbitmq}.rabbitmqInstance.config.healthdata.routingkey.from_cosim": "from_cosim"
  }
}

The coe json looks like:

{
  "startTime": 0,
  "endTime": 10,
  "multimodel_path": "test.json",
  "liveGraphColumns": "1",
  "liveGraphVisibleRowCount": "1",
  "graphs": [
    {
      "title": "Graph",
      "livestream": {
        "{pressurepipe}.pressurepipeInstance": ["h2s", "h2s_timestamp"],
        "{rabbitmq}.rabbitmqInstance": ["flow", "flow_timestamp"]
      },
      "externalWindow": false
    }
  ],
  "livestreamInterval": 0,
  "logVariables": {},
  "visible": false,
  "loggingOn": true,
  "overrideLogLevel": null,
  "enableAllLogCategoriesPerInstance": false,
  "algorithm": { "type": "fixed-step", "size": 0.01 },
  "postProcessingScript": "",
  "multimodel_crc": "c152a564daa9766d3a1b96d9eb7b3d5b",
  "parallelSimulation": false,
  "stabalizationEnabled": false,
  "global_absolute_tolerance": 0,
  "global_relative_tolerance": 0.01,
  "simulationProgramDelay": false,
  "convergenceAttempts": 5
}

The command used to generate the spec:

java -jar maestro.jar import -v Sg1 test.json coe.json -output .

The two fmus are:
rabbitmq.zip
pressure_pipe.zip

Removing the two of the connections from one fmu to the other fixes the issue.