ace location="latlong_wgs84" mapset="chelsa_climate_south_america" grass_command="g.list type=raster"
...
{
  "accept_datetime": "2021-04-23 07:15:52.849249",
  "accept_timestamp": 1619162152.8492472,
  "api_info": {
    "endpoint": "asyncpersistentresource",
    "method": "POST",
    "path": "/api/v1/locations/latlong_wgs84/mapsets/chelsa_climate_south_america/processing_async",
    "request_url": "http://actinia.mundialis.de/api/v1/locations/latlong_wgs84/mapsets/chelsa_climate_south_america/processing_async"
  },
  "datetime": "2021-04-23 07:15:53.008159",
  "exception": {
    "message": "AsyncProcessError:  Mapset <chelsa_climate_south_america> exists in the global dataset and can not be modified.",
    "traceback": [
      "  File \"/usr/lib/python3.8/site-packages/actinia_core/resources/ephemeral_processing.py\", line 1356, in run\n    self._execute()\n",
      "  File \"/usr/lib/python3.8/site-packages/actinia_core/resources/persistent_processing.py\", line 560, in _execute\n    self._check_lock_target_mapset()\n",
      "  File \"/usr/lib/python3.8/site-packages/actinia_core/resources/persistent_processing.py\", line 370, in _check_lock_target_mapset\n    self.target_mapset_exists = self._check_mapset(self.target_mapset_name)\n",
      "  File \"/usr/lib/python3.8/site-packages/actinia_core/resources/persistent_processing.py\", line 326, in _check_mapset\n    raise AsyncProcessError(\"Mapset <%s> exists in the global \"\n"
    ],
    "type": "<class 'actinia_core.resources.common.exceptions.AsyncProcessError'>"
  },
  "http_code": 400,
  "message": "AsyncProcessError:  Mapset <chelsa_climate_south_america> exists in the global dataset and can not be modified.",
  "process_chain_list": [
    {
      "list": [
        {
          "id": "g.list_1804289383",
          "inputs": [
            {
              "param": "type",
              "value": "raster"
            },
            {
              "param": "separator",
              "value": "newline"
            }
          ],
          "module": "g.list"
        }
      ],
      "version": "1"
    }
  ],
  "process_log": [],
  "progress": {
    "num_of_steps": 1,
    "step": 0
  },
  "resource_id": "resource_id-60535ec9-bd60-4910-932c-aab3163f3ea9",
  "status": "error",
  "time_delta": 0.1589653491973877,
  "timestamp": 1619162153.008107,
  "urls": {
    "resources": [],
    "status": "https://actinia.mundialis.de/api/v1/resources/veroandreo/resource_id-60535ec9-bd60-4910-932c-aab3163f3ea9"
  },
  "user_id": "veroandreo"
}

ace location="latlong_wgs84" grass_command="g.list type=raster mapset=chelsa_climate_south_america"
https://actinia.mundialis.de/api/v1/locations/latlong_wgs84/processing_async_export
{'version': '1', 'list': [{'module': 'g.list', 'id': 'g.list_1804289383', 'inputs': [{'param': 'type', 'value': 'raster'}, {'param': 'mapset', 'value': 'chelsa_climate_south_america'}, {'param': 'separator', 'value': 'newline'}]}]}
veroandreo
Resource status accepted
Polling: https://actinia.mundialis.de/api/v1/resources/veroandreo/resource_id-3e22b95c-e1f6-4bcb-9303-1af736f4f03a
Resource poll status: accepted
Resource accepted
Resource poll status: finished
Processing successfully finished
--------------------------------------------------------------------------
CHELSA_bio10_01
CHELSA_bio10_02
CHELSA_bio10_03
CHELSA_bio10_04
...

I suspect these changes within PR #1:
- 332297130b8c0863c2ed63ccea6404bd3edd6dc7
- 9d61111d655eea46f2dfabffdc779379b7e75cd6
- (maybe more)

I think that the originally present `-p` flag would be more intuitive.