mulitple-test et json.decoder.JSONDecodeError

Sur plusieurs slaves, should-get-tests/productive.should est en échec a priori sur dev, comme dans https://gitlab.inria.fr/vidjil/vidjil/-/jobs/927650 :

should-get-tests/productive.should
  (...)
  File "should.py", line 401, in deep_get
    raise KeyError(key)
KeyError: 'clones[1].seg.junction.unproductive'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "should.py", line 1324, in <module>
    fs.test(variables = variables, cd = args.cd, cd_same = args.cd_same, output = args.output, verbose = args.verbose, only = only)
  File "should.py", line 1177, in test
    s.test(open(f), variables, verbose - 1, only=only)
  File "should.py", line 952, in test
    self.one_test(test, current_test_lines, verbose, colorize)
  File "should.py", line 1060, in one_test
    test.test(test_lines, variables=self.variables_all, verbose=verbose-1)
  File "should.py", line 747, in test
    except (json.decoder.JSONDecodeError, KeyError):
AttributeError: 'module' object has no attribute 'JSONDecodeError'

Une version de python qui n'est pas la bonne ?