Does the new feature `Importing version recommendations from a Maven BOM` disable old way of dependency resolution?

Hi,

I wanted to try the new gradle 4.6 feature Importing version recommendations from a Maven BOM and just applied the setting:

enableFeaturePreview('IMPROVED_POM_SUPPORT')

In the settings.gradle without changing anything else.
When I then run ./gradlew build, suddenly I get unresolved reference compile errors on those places where the library is used.

So are then dependencies like

compile("org.reactivestreams:reactive-streams:1.0.1")

not longer supported with the BOM-feature enabled?

kind regards