Github Actions: Test failures with both node v14 and v16 in Github Actions CI

Summary of all failing tests
4042FAIL src/components/POLine/Item/ItemForm.test.js
4043  ● ItemForm › should call onChangeField when 'ContributorForm'
40444045    TypeError: Cannot read property 'forEach' of undefined
40464047      111 |       } else {
4048      112 |         change('instanceId', null);
4049    > 113 |         locations.forEach((_, i) => change(`locations[${i}].holdingId`, null));
4050          |                   ^
4051      114 |       }
4052      115 |     });
4053      116 |   };
40544055      at src/components/POLine/Item/ItemForm.js:113:19
4056      at Timeout.task [as _onTimeout] (node_modules/jsdom/lib/jsdom/browser/Window.js:516:19)
405740584059Test Suites: 1 failed, 199 passed, 200 total
4060Tests:       1 failed, 470 passed, 471 total
4061Snapshots:   0 total
4062Time:        196.943 s
4063Ran all test suites.
4064error Command failed with exit code 1.
4065info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
4066error Command failed with exit code 1.
4067info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
4068Error: Process completed with exit code 1.