ID 418387 - The toolbar_label_points disappear from the Viewer when scrubbing the timeline with the Dopesheet active

Problem summary
The toolbar_label_points disappear when scrubbing the timeline with the Dopesheet active.

Customer reported version
nuke.12.0v3

Customer reported platform
windows10

Steps to reproduce

1) In Nuke, create a Checkerboard and GridWarp Tracker node.
2) Add a Transform node and translate the X,Y values between two frames.
3) Double-click the GridWarpTracker node to enable it in the Viewer.
4) Click+Drag the mouse in the Viewer to select points on the Grid.
5) View the available numbers, then open the DopeSheet.
6) Click and drag the timeline in the Dopesheet and observe the Viewer for the point numbers.

Expected behavior
The point numbers should remain visible on the wireframe grid while toolbar_label_points is active.

Actual behavior
The point numbers disappear, and sometimes reappear when scrubbing the timeline.

Workaround
Sometimes turning the toolbar_label_points knob off and back on in the Viewer makes the numbers reappear, but not always.

Reproduced by Support in
Nuke 12.0v3 - Windows 10, CentOS 7, macOS 10.14

Nuke 12.0v1 - Windows 10

Earliest version tested
Nuke 11.3v6 - This feature did not exist before this version