Services module provides an out of the box resource for comments, but for some reason it rolls its own access checks. It would be nice if the deletion permissions in this module also applied to the Services comment resource.
Needs review
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
You're right to notice that the Services module in Drupal (especially in versions 7 and early 8) sometimes implements its own access checks rather than relying on Drupal's standard entity access system. This includes the comment resource, HumanToCat Translator