Reproduction steps:
1. Open the attached file "case885865-small.zip";
2. Open the scene "level1";
3. Build the project and open it;
4. Press "t" and observe the number of key collected (Built game value.jpg);
5. Come back to the project and enter Play mode;
6. Press "t" and observe the number of key collected (Value in the Editor.jpg);

Actual result: the number of key collected is different in the Editor (the number is 1) and in the built game (the number is 2 or 3).
Expected result: the number of key collected should be the same in the Editor and in the built game.

Note: If the built game shows the same number like in the Editor, try to build the project on the built game (repeat). Also, sometimes, when the text in Canvas -> KeyText is changed from "Key Collected: 1" to "Key Collected: 0", everything works fine.
Sometimes different behaviour happens, the key in the Editor is 2 or 3 and in the built game 1. Also, when the built game is opened again, the number of key is changing with each opening. According to the script, everything should work fine.

Reproduced with: 5.5.0b1, 5.5.0f3, 5.6.0b10, 2017.1.0a2
Not reproducible with: 5.4.4p3, 5.5.0a6
Regression introduced in 5.5.0b1