8.x-1.x-dev doesn't appear to function for me

This may be a bug, or it may be me doing something wrong. When I use "Reanalyze content for links" or "Clear link data and analyze content for links" no links are found. Nothing appears in the Watchdog log, the "Broken links" report is empty, and the "linkchecker_index" and "linkchecker_link" tables remain empty.

I'm using 8.x-1.x-dev with the following patches (all updated within the past few days with status "reviewed and tested by the community" or "needs review"):

"3058014 - Add support for Redirect module": "https://www.drupal.org/files/issues/2020-01-27/3058014-4.patch",
"3092304 - Add support for Dynamic Entity Reference 2.x": "https://www.drupal.org/files/issues/2020-01-24/3092304-4.patch",
"3104570 - Remove unused files that comes from the drupal7 version": "https://www.drupal.org/files/issues/2020-01-06/3104570-remove-unused-files-2.patch",
"3104574 - Remove unused code that comes from the drupal7 version in module": "https://www.drupal.org/files/issues/2020-01-06/3104574-remove-unused-code-2.patch",
"3109152 - Move _linkchecker_isvalid_response_code out of .module file to a dedicated service.": "https://www.drupal.org/files/issues/2020-01-28/3109152-5.patch",
"3109158 - Move LINKCHECKER_DEFAULT_FILTER_BLACKLIST out of .module file to LinkCheckerAdminSettingsForm.": "https://www.drupal.org/files/issues/2020-01-27/3109158-2.patch",
"3109178 - Move linkchecker_watchdog_log out of .module to a dedicated service.": "https://www.drupal.org/files/issues/2020-01-27/3109172-3.patch"

I've tried some other patch combinations with no difference in behavior.

I've got a single basic page node with three links in it, two working, one pointed at a nonexistent server:

<p><a href="https://apple.com">Apple</a>
  <br />
  <a href="https://google.com">Google</a>
  <br />
  <a href="https://fakething.mo.gov">Bad link</a>
</p>

Configuration seems to work fine; I can access the form, and the configuration is updated:

check_links_types: 1
default_url_scheme: 'https://'
base_path: foo.mo.gov
extract:
  from_a: true
  from_audio: false
  from_embed: false
  from_iframe: false
  from_img: false
  from_object: false
  from_video: false
  filter_blacklist:
    filter_align: filter_align
    filter_autop: filter_autop
    filter_caption: filter_caption
    blazy_filter: '0'
    editor_file_reference: '0'
    entity_embed: '0'
    filter_html: '0'
    filter_htmlcorrector: '0'
    filter_html_escape: '0'
    filter_html_image_secure: '0'
    filter_url: '0'
    linkit: '0'
    media_embed: '0'
    filter_file_link_classes: '0'
    nbsp_cleaner_filter: '0'
check:
  connections_max: 8
  connections_max_per_domain: 2
  disable_link_check_for_urls: "example.com\nexample.net\nexample.org"
  library: core
  interval: 2419200
  useragent: 'Drupal (+https://drupal.org/)'
error:
  action_status_code_301: 1
  action_status_code_404: 0
  ignore_response_codes: "200\r\n206\r\n302\r\n304\r\n401\r\n403"
  impersonate_account: administrator
logging:
  level: 6
_core:
  default_config_hash: FzFKuqOuk667AkDorrqvXkc_-M4D-Ac1XeGGusxS1JU
scan_blocks: null