SUMMARY
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STEPS TO REPRODUCE
1. Switching Times: Custom times
2. Day color temperature: 6,500K
3. Night color temperature: 1,000K
4. Begin night color at: 19:59
5. Begin day color at: 03:00
6. Transition duration 60 minutes
--Screen locking settings:
1. Lock screen automatically: [x] 98 minutes
2. [x] After waking from sleep
3. Allow unlocking without password for: 15 seconds
--Usage:
1. Use computer normally until Night color begins
2. Wait a couple of hours and go to bed
3. Let screen lock on its own
4. Wake up
5. Unlock screen (any time after 3 am; usually some time after 5am)

OBSERVED RESULT
Night color is still active

EXPECTED RESULT
Day color should have activated

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
I have to click the Night color off manually in the system tray and back on and everything is back to day color.