Exception while compiling expression graph is thrown on assigning Event node to Output Event node.

Steps to repro:
1. Create a new URP template project
2. Project window > Click on "+" > Visual Effects > Visual Effect.
3. Open Visual Effect Graph > Right Click > Search for "Output Event" node.
4. Assign Event node to "Output Event" node.

Actual Result:
Exception while compiling expression graph is thrown in the console.

Expected Result:
No errors in the console.

Reproducible in:
2020.2.0a20 with Package version 10.0.0-preview.27.

Note: Output Event introduced in 10.0.0-preview.27 which is available only in 2020.2.0a20.

Environment:
Occurring on Windows 10 & Mac 10.15.

Stacktrace:
New VFX : Exception while compiling expression graph: System.InvalidOperationException: VFXDataOutputEvent unexpected link on Output event
at UnityEditor.VFX.VFXDataOutputEvent.FillDescs (System.Collections.Generic.List`1[T] outBufferDescs, System.Collections.Generic.List`1[T] outTemporaryBufferDescs, System.Collections.Generic.List`1[T] outSystemDescs, UnityEditor.VFX.VFXExpressionGraph expressionGraph, System.Collections.Generic.Dictionary`2[TKey,TValue] contextToCompiledData, System.Collections.Generic.Dictionary`2[TKey,TValue] contextSpawnToBufferIndex, UnityEditor.VFX.VFXDependentBuffersData dependentBuffers, System.Collections.Generic.Dictionary`2[TKey,TValue] effectiveFlowInputLinks, UnityEditor.VFX.VFXSystemNames systemNames) [0x00163] in c:\users\gs1799\downloads\customevent-urp\library\packagecache\com.unity.visualeffectgraph@10.0.0-preview.27\editor\data\vfxdataoutputevent.cs:91
at UnityEditor.VFX.VFXGraphCompiledData.Compile (UnityEditor.VFX.VFXCompilationMode compilationMode, System.Boolean forceShaderValidation) [0x00836] in c:\users\gs1799\downloads\customevent-urp\library\packagecache\com.unity.visualeffectgraph@10.0.0-preview.27\editor\compiler\vfxgraphcompileddata.cs:1142 : at UnityEditor.VFX.VFXDataOutputEvent.FillDescs (System.Collections.Generic.List`1[T] outBufferDescs, System.Collections.Generic.List`1[T] outTemporaryBufferDescs, System.Collections.Generic.List`1[T] outSystemDescs, UnityEditor.VFX.VFXExpressionGraph expressionGraph, System.Collections.Generic.Dictionary`2[TKey,TValue] contextToCompiledData, System.Collections.Generic.Dictionary`2[TKey,TValue] contextSpawnToBufferIndex, UnityEditor.VFX.VFXDependentBuffersData dependentBuffers, System.Collections.Generic.Dictionary`2[TKey,TValue] effectiveFlowInputLinks, UnityEditor.VFX.VFXSystemNames systemNames) [0x00163] in c:\users\gs1799\downloads\customevent-urp\library\packagecache\com.unity.visualeffectgraph@10.0.0-preview.27\editor\data\vfxdataoutputevent.cs:91
at UnityEditor.VFX.VFXGraphCompiledData.Compile (UnityEditor.VFX.VFXCompilationMode compilationMode, System.Boolean forceShaderValidation) [0x00836] in c:\users\gs1799\downloads\customevent-urp\library\packagecache\com.unity.visualeffectgraph@10.0.0-preview.27\editor\compiler\vfxgraphcompileddata.cs:1142
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)