Wrong query displayed in GUI "show API code" feature

When searching using the "only_atoms" keyword, the query displayed in the "Show API code" feature is wrong:

import requests
response = requests.post('http://nomad-lab.eu/prod/rae/api/archive/query', json={
    'query': {
        'domain': 'dft',
        'dft.basis_set': '(L)APW+lo',
        'dft.system': 'bulk',
        'dft.code_name': 'exciting',
        'only_atoms': 'O'
    }
})
data = response.json()

inspection of data yields:

>> data

{'code': 400,
 'description': 'The browser (or proxy) sent a request that this server could not understand.',
 'errors': {'query.only_atoms': "'O' is not of type 'array'"},
 'message': 'Input payload validation failed',
 'name': 'Bad Request'}

The problem can be avoided by manually changing the query part into an array:

'only_atoms': ['O']