Ok, some thoughts - I've tested all noises and they worked (in beta), only OSL bump output was very weak, not only for Corona but for all renderers. When I tested after 2019 release the bump output was stronger, so that was probably fixed.
In your case, the 3D OSL noise should work as this one works in object space - please test this one.
The OSL noise you're using is 2D, so you may have to define the mapping by connecting an OSL UVW node to the UVW slot of the 2D noise. See if that works without the BumpConverter.
Then again, OSL defaults to map channel 1 if no UVW input is defined so it should have worked since the sphere primitive defines UVs for channel 1 by default as well. So not sure why it didn't work for bump while it works for displacement... Still, try with a UVW node in the OSL noise UVW slot and see if that helps.