Missing Drawings on Top View

In Toon Boom Harmony 17 Premium, I have noticed that when a Deformation Bones is applied to a Drawing Layer, it disappears in the Top View, so it is impossible to have a quick view of the position of that object in the Z-axis. This didn’t happen in previous versions, making the Top View very useful for working with deformation-based cut-out characters in a multi-plane scene environment. With this bug, that becomes difficult and I can only use the Perspective View. Is this due to a bug in Version 17? Is there a way to make these objects visible?

Thank You

Emmanuel