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This should work.
I tested a similar case when the middle level of the 3-level category was set for the product and the tab type also, and this worked for me without any problem.
I suspect that something has changed on your site, which made this problem. At this moment I did not find any problem in our plugin (using in a standard environment). Maybe there is a plugin conflict on your site.
Can you test that if you deactivate all other plugins (except WooCommerce), is there a problem?
One more question: on the product edit page of this product in “Streaming” category, can you see the editor field of “what-is-streaming” tab? (I suppose it is empty, but is this field shown or is not?)