Sitewide blocks disappearing upon multilingual mapping

With, when I define a new multilingual content section using a parent page that contains sitewide blocks (e.g. language selector), these blocks disappear and refuse to be added (again):

call_user_func_array() expects parameter 1 to be a valid callback, class 'Concrete\Core\Permission\Key\AddBlockBlockTypeKey' does not have a method 'canAddBlock'

Once the multilingual content section (mapping) is deleted, the sitewide blocks reappear!

Have you seen this?

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b3rimbau replied on at Permalink Reply
I think this might have been reported as a bug in 8.0.3