Provider Mythic-Beasts with TXT only API access level

[Veldkornet]

With my mythic beasts api key access level set to allow writing of txt records only, I just get the following error:

 + Deploying challenge tokens...
deploy_challenge called: www.example.com, xxxxxxxxxxxxxxx, xxxxxxxxxxxxxxxxxxxx
Traceback (most recent call last):
  File "/usr/bin/lexicon", line 8, in <module>
    sys.exit(main())
  File "/usr/lib/python3.8/site-packages/lexicon/cli.py", line 131, in main
    results = client.execute()
  File "/usr/lib/python3.8/site-packages/lexicon/client.py", line 88, in execute
    return self.provider.create_record(record_type, name, content)
  File "/usr/lib/python3.8/site-packages/lexicon/providers/base.py", line 79, in create_record
    return self._create_record(rtype, name, content)
  File "/usr/lib/python3.8/site-packages/lexicon/providers/mythicbeasts.py", line 119, in _create_record
    payload = self._post(f"/zones/{self.domain}/records", data)
  File "/usr/lib/python3.8/site-packages/lexicon/providers/base.py", line 181, in _post
    return self._request("POST", url, data=data, query_params=query_params)
  File "/usr/lib/python3.8/site-packages/lexicon/providers/mythicbeasts.py", line 290, in _rekest
    response.raise_for_status()
  File "/usr/lib/python3.8/site-packages/requests/models.py", line 953, in raise_for_status
    raise HTTPError(http_error_msg, response=self)
requests.exceptions.HTTPError: 403 Client Error: Access denied for url: https://api.mythic-beasts.com/dns/v2/zones/example.com/records
ERROR: deploy_challenge hook returned with non-zero exit code

But, I change the access level of the API key to allow writing of “ALL” records instead of just “TXT” records, then it worked. Any idea why this is? It’s anyway just writing txt records.