1. The metric "Quality Gate Status" is computed at project level, though when the Treemap is configured with "Projects" filter, the result is the one expected. As soon as you are using the widget drilldown, all sub components are colored in grey because the metric is not available at this level.
2. While configuring the Treemap to display Views that aggregates many projects, only the first level is well displayed. Widget drilldown displays all sub-components in grey (even at project level).