Steps to reproduce:

1. Download and import attached project.
2. Open scene: main.
3. Select particle system (1).
4. In inspector, over particle system module top right, click on Open Editor...
5. Make sure you see both child and parent system components.
6. Place a tick on one system collision module.
7. Look at the message boxes (with automatic culling disabled) at top right corner. (GIF attached.)

Expected result: Only one message box appears on which you enabled collision.
Actual result: Message boxes appears for both particles.

Notes: Same happens on inspector window, but it is harder to notice.

Reproduced on: 5.4.0b7, 5.3.3f1, 5.2.4f1.