Subsequent runs of subgraph leads to different output using WaitForAll node

Description

Initial Setup
Create the following graph:

1. Start (Repeat On)
2. Run In Parallel
   1. Log 1
   2. Log 2; Wait for 3 seconds
   3. Log 3
3. Wait for All (1, 2 and 3 above)
4. Log 4

Steps to reproduce:
Put the graph in a scene and run

Actual results: 

1. First Run

   1
   2
   3
   4 // after 3 sec
   

2. Second Run

   1
   2
   3
   4
   4
   4 // after 3sec
   

Expected results:
Every run should have the same output:

1
2
3
4 // after 3 sec