Neither domain settings nor the default settings are applied when a link is automatically loaded in new tab
Not only that, but domain settings aren't applied at all to that tab in the future.
I would like to get rid of automatic loading of new tabs (the _blank target), which is #967, but Qt WebEngine makes this ridiculously hard.
However, it seems that any tab opened this way doesn't load either the default settings or domain settings. Nor will it ever load domain settings (which means that it probably somehow skips the proper initialization).