Since 4.11.0-2020-05-06 r29052 / 865dd83, the 2D views are not synchronized with shift+mouse on a VolumeRendering 3D view. This was OK with 4.11.0-2020-04-30 r29028 / 1956d89.
The 2D views do get synchronized with shift+mouse on a 2D view however.
Thank you for looking into this.
Regards.