Why does matlab rename my simulink logsout file?

Hello,

I would like to run multiple simulation with batchsim. The following code should setup the required simulation input objects in a for loop. In the newFileName is stored the output mat file names. Someting like {'simulationfile_a.mat', 'simulationfile_b.mat', 'simulationfile_c.mat'}

After running the simulation the i got .mat files with name like simulationfile_a_1.mat, simulationfile_b_2.mat, simulationfile_c_3.mat.

Why?

How to rename the files to the original?

This this renaming only happens with batchsim. With parsim it was ok.

%Setup SI
in(i) = Simulink.SimulationInput(model);
in(i) = in(i).setModelParameter(...
    'StopTime', num2str(stop_time.sim_end),...   
    'LoggingFileName', newFileName{i},...
    'SignalLogging', 'on',...
    'LoggingToFile', 'on',...
    'SaveFormat', 'Dataset',...
    'SaveTime', 'off',...
    'SaveState', 'off',...
    'SaveOutput', 'off',...
    'SaveFinalState', 'off',..
    'DSMLogging', 'off',...
    'ReturnWorkspaceOutputs', 'on',...
    'Profile', 'off',...
    'InspectSignalLogs', 'off',...
    'DatasetSignalFormat', 'timeseries');
    
%run batch
simJob = batchsim(myCluster, in, ...
    'Pool', min(myCluster.NumWorkers-1, length(newFileName)),...
    'AutoAddClientPath', false,...
    'ManageDependencies', 'off',...
    'AttachedFiles',filesToAttach,...
    'ShowProgress','on',...
    'TransferBaseWorkspaceVariables', 'off',...
    'CleanupFcn', @Simulink.sdi.clear);