Developers can't alter the entity selected by metatag_get_route_entity. An example where this would be useful: If the route entity is a GroupContent entity, someone might want to replace that with the referenced content entity.
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Pass the output of the function thought an alter hook.
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Needs work
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
This hook was exactly what I needed in my case, as on Nodes in a Group, a GroupRelationship entity was picked up by metatag_get_route_entity().
And not the actual Node itself. This resulted in the incorrect Metatags being generated.