UI Toolkit 1.0.0-preview.6 broke Visual Effect Graph?

Unity: 2020.2.0a19
URP: 8.2.0
UI Toolkit: 1.0.0-preview.6

If I try to open a *.vfx file, the visual effect graph editor does not load the file and suggests me to create a new one.

Also, a Windows popup appears asking me to choose an application to use to open the file:

In the console, this error appears:
MissingFieldException: Field ‘UnityEngine.UIElements.VisualElement.isBoundingBoxDirty’ not found.
UnityEditor.Experimental.GraphView.Scope.UpdateGeometryFromContent () (at <5b91b818930242e2a5b3695c18f530f5>:0)
UnityEditor.Experimental.GraphView.Scope.b__38_0 (UnityEngine.UIElements.TimerState t) (at <5b91b818930242e2a5b3695c18f530f5>:0)
UnityEngine.UIElements.VisualElement+TimerStateScheduledItem.PerformTimerUpdate (UnityEngine.UIElements.TimerState state) (at Library/PackageCache/com.unity.ui@1.0.0-preview.6/Core/VisualElementScheduler.cs:324)
UnityEngine.UIElements.TimerEventScheduler.UpdateScheduledEvents () (at Library/PackageCache/com.unity.ui@1.0.0-preview.6/Core/Scheduler.cs:360)
UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.UpdateSchedulers () (at Library/PackageCache/com.unity.ui@1.0.0-preview.6/Core/UIElementsUtility.cs:254)
UnityEngine.UIElements.UIEventRegistration.UpdateSchedulers () (at Library/PackageCache/com.unity.ui@1.0.0-preview.6/Core/UIElementsUtility.cs:105)
UnityEditor.RetainedMode.UpdateSchedulers () (at Library/PackageCache/com.unity.ui@1.0.0-preview.6/Editor/RetainedMode.cs:50)

Hello,

I tried to reproduce this without success. Does this happen if you close and re-open Unity?
Reporting a bug with your manifest and Editor.log file would help greatly.

Note that we’re aware of some graphical corruptions in VFX or Shader Graph when using our package, we’re fixing this for the next versions of Unity 2020.1 and 2020.2.

Hi Antoine,

I actually found the culprit.
If the VFX contains a selection group (or you add one in a new VFX), the editor becomes unusable.

6175797--676098--upload_2020-8-6_15-49-10.png

6175797--676101--upload_2020-8-6_15-49-30.png

@antoine-unity Here are the Editor.log and manifest.json.

Visual Effect Assets without selection groups inside work fine.

6175818–676119–Packages.zip (24.5 KB)

Adding another info on this: Shader Graph has the same problem too (I guess the editor is shared with VFX graph).

Select any node → Right click → Group Selection
6178707--676557--upload_2020-8-7_9-40-18.png

Hello, I have identified the issue.

This will be fixed when 2020.2.0a20 goes public. Thank you.