*Steps to reproduce:*
# Open the attached package 
# Open VFX
# Connect 'Spawn Event' GPU Event to 'Initialize Particle Strip' Init context

*Actual results:* Error is thrown, vfx stops compiling

*Expected results:* Disconnect connection from previous system if it connected to a new valid one

*Reproducible with versions:* 6000.4.0a1

*Not reproducible with versions:* 

*Can’t test with versions:* 

*Tested on (OS):* macOS

*Notes:*
* tested on trunk only
* Unity cannot compile the VisualEffectAsset at path "Assets/Repro-Context-Connections/New VFX.vfx" because of the following exception:
System.InvalidOperationException: Unexpected multiple GPU Event
  at UnityEditor.VFX.VFXGraphCompiledData+<ComputeEventListFromSlot>d__33.MoveNext () [0x0007b] in /Users/vita.skruibyte/Documents/unity/packages/com.unity.visualeffectgraph/Editor/Compiler/VFXGraphCompiledData.cs:1083