If you add a fake player to the scoreboard, and set a score for him in an objective that has a display of 'list' (The tab player list), the fake player wont show up.
What I expected to happen was...
The fake player would show up in the tab list, displaying his name and score.
What actually happened was...
Only real players were displayed on the tab list.
Steps to reproduce:
A. Run these commands by order:
1. /scoreboard objectives add test dummy
2. /scoreboard objectives setdisplay list test
3. /scoreboard players set test test 1
B. Hold tab.
C. Observe only real players on the tab list, and the fake player "test" not showing up.