Failed reproducibility in parallel cluster validation

Hello,

I'm writing a series of tests to validate our computing environment, and I'm following some instructions from here to write my cluster validation. I'm running into a very weird error when running the following code:

cluster = parcluster('Processes');
job1 = createCommunicatingJob(cluster, 'Type', 'spmd') ;
createTask(job1, @spmdIndex, 1, {});
submit(job1);
wait(job1);
out = fetchOutputs(job1)

When I run the script (by hitting F5), when it gets to this point it raises the following error:

Error using parallel.Job/fetchOutputs (line 1431)

Task with ID 8 returned 0 outputs but 1 were expected.

Error in N03_parallel_computing (line 74)

out = fetchOutputs(job1)

^^^^^^^^^^^^^^^^^^

However, if right after that, I select the code and run it with F9, then it runs without any error.

Additional information, before that I run this code:

job = createJob (cluster);
createTask(job, @sum, 1, {[1 1]});
submit(job);
wait(job);
out = fetchOutputs(job)

which also runs with no error.

I reproduced the same error in a different instance of Matlab installed in a different workstation. This is for R2024b.

Thank you,

Paulo