[Bug] Fast Draft - Composition disappears when panning viewer
Steps to reproduce:
1. Enable Fast Previews > Fast Draft
2. Using Hand Tool ('H' or Spacebar) pan the composition viewer
Result: Composition visiblity clears revealing background color. Composition reappears after a separate user interaction.
Expected: Composition remains visible, just repositioned in the viewer.
System info
Application: After Effects (Beta) v17.6.0.5
OS: Windows v10.0.19041, RAM: 31.95 GB, CPUs (logical): 8
