After we uninstall comment module, the following code still lists comment_body field of comment entity.
\Drupal::service('entity_field.manager')->getFieldMapByFieldType('text_long');
Ideally, the comment entity fields should not appear as module is uninstalled.
After investigation, it was found that key_value table still has an entry of entity.definitions.bundle_field_map collection corresponding to the comment (name column). This leads to entity_field.manager listing the comment entity fields as well.
Postponed: needs info
9.5
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Tried to reproduce:
* Clean Umami install
* Enabled Comment module
* Checked key_value table, comment entry was there
* Uninstall comment module
* Checked key_value table, comment entry was gone
Can you reproduce this on a clean Drupal install?