When a taxonomy reference field allows to select terms from more than one vocabulary, they are all merged into the same tree which can be really confusing.
Allow site builders to define how to handle multiple vocabularies:
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Enjoy :)
The widget has a different behavior given its settings.
A new field is exposed on the widget configuration form.
None.
A new setting appears on the widget.
Active
2.0
User interface
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I applied this issue's patch to version 2.0.x of the project. Only one location needed a small adjustment.