Where did history-tab Changes in model go in 10.12.4?

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Where did history-tab "Changes in model" go in 10.12.4? In 10.12.3 it is still there, in 10.12.4 it is gone. Any idea if there is a setting, or is this just a bug?   Also: In the "App explorer tree", when you rightclick on any document, and select "Show history", it will show you an empty list.
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