Projects where there are problems installing the code with composer or Drupal. There are a variety of reasons, but this means that no deprecation checking is possible for them yet, until those are fixed. Some of these are artifacts of how the testing is done and may not be fixable in your project (for example, extra PHP extensions required that are not available or newer PHP main version required). We may not be able to fix scanning of those projects. However many of the problems are fixable in the projects.
Results are from dataset #58581 from 2023-12-03T12:36. Report is ran by the Drupal Association regularly.