When referencing Group Content entities (node's referenced within a group) with Linkit widget, unable to save the node due to following error:
The path 'entity:group_content/[ID]' is invalid.
Not entirely sure why exactly it throws the error, as looking at line 104 of LinkitHelper.php the group_content entity itself is loaded without any problem.
Maybe it has to do with internal path is not the usual internal:/[entity_type]/[id] but instead internal:/group/[group_id]/content/[id]. Although it appears to load the entity without any issues.
Assumes that Groups and Linkit module installed and enabled, and that Groups and Group Content already exist on the site:
Node edit form reloads with error message: The path 'entity:group_content/[ID]' is invalid.
Possibly identify when entity type's internal path is nested within another entity and adjust helper functions accordingly.
Active
6.1
Code
Provided a workaround for anyone else encountering this issue, to always use the internal path.
It's far from ideal as it is specific to group_content entity, rather than generic solution for any other potential use cases.