Can no longer bulk edit material properties with the property matrix

In 4.7 you could select multiple material assets in the content browser, right click and choose Asset Actions > Property Matrix to bulk edit material properties, but in 4.8 and 4.9, this feature is curiously absent.

It is still referenced in the documentation here:

https://docs.unrealengine.com/latest/INT/Engine/Rendering/Materials/MaterialProperties/index.html

Is this intentional or a regression? I'm not seeing any other obvious way to bulk edit material properties.

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