Opening a singleplayer world is counted as a multiplayer join in the statistics

When opening a singleplayer world, the multiplayer joins count in the stats increases.

What I expected to happen was...:
Only multiplayer joins would be counted as multiplayer joins.

What actually happened was...:
Singleplayer joins are counted too.

Steps to Reproduce:
1. Open a singleplayer world.
2. Go to stats in the pause menu and look at the multiplayer joins count.
3. Close and re-open the world.
4. Check the stats again and notice the number has increased.