Hello,
I again experienced this issue a few times since I posted above message. Also, it appears this issue was faced and reported by others too. Anyway, here are details.
1. Windows version 23H2 (OS Builde 22631.3880)
2. ObjectDock 3.01
3. Display scale: 100% (Recommended). Resolution 1920 x 1080. Connection type HDMI.
4. ObjectDock is set to auto start on login so this issue (when it happens) happens upon logging in after a computer restart