Upgrade to macOS 10.15.4 Fixed LG 5K Monitor Issue
Yesterday morning I updated my 16" MacBook Pro laptop to macOS 10.15.4, and this morning I noticed that one of the nagging problems with my LG 5K monitor was gone! In the past, this new laptop and the LG 5K weren't really happy with one another. When I'd wake up the laptop in the morning, the attached display would not wake up, but it also wasn't unattached.
The windows were still "on" the LG 5K, but I couldn't see them, and I couldn't move them because I couldn't see them, and that meant that I have to unplug the LG 5K... let the laptop rearrange things... then plug it back in. It wasn't the worst thing in the world, but it was annoying.
Well... after the update this morning, it's now working exactly as expected. 🙂 That's a wonderful development! Now things are just working exactly as they should... very pleased.