Bug Unable to build due to Probuilder, Mesh.Colors is out of bounds error

Probuilder is preventing builds by throwing the following error between 30-60 times every time I try to run a build. Any idea on what to do? It's been happening for a while, but now I can't even seem to get around it since updating to 2021.1

Mesh.colors is out of bounds. The supplied array needs to be the same size as the Mesh.vertices array.
UnityEngine.StackTraceUtility:ExtractStackTrace ()
UnityEngine.Mesh:SetSizedArrayForChannel (UnityEngine.Rendering.VertexAttribute,UnityEngine.Rendering.VertexAttributeFormat,int,System.Array,int,int,int,UnityEngine.Rendering.MeshUpdateFlags)
UnityEngine.Mesh:SetArrayForChannel<UnityEngine.Color> (UnityEngine.Rendering.VertexAttribute,UnityEngine.Color[],UnityEngine.Rendering.MeshUpdateFlags)
UnityEngine.Mesh:set_colors (UnityEngine.Color[])
UnityEngine.ProBuilder.ProBuilderMesh:RefreshColors () (at Library/PackageCache/com.unity.probuilder@5.0.3/Runtime/Core/ProBuilderMeshFunction.cs:519)
UnityEngine.ProBuilder.ProBuilderMesh:Refresh (UnityEngine.ProBuilder.RefreshMask) (at Library/PackageCache/com.unity.probuilder@5.0.3/Runtime/Core/ProBuilderMeshFunction.cs:404)
UnityEngine.ProBuilder.ProBuilderMesh:MakeUnique () (at Library/PackageCache/com.unity.probuilder@5.0.3/Runtime/Core/ProBuilderMeshFunction.cs:358)
UnityEditor.ProBuilder.EditorUtility:SynchronizeWithMeshFilter (UnityEngine.ProBuilder.ProBuilderMesh) (at Library/PackageCache/com.unity.probuilder@5.0.3/Editor/EditorCore/EditorUtility.cs:226)
UnityEditor.ProBuilder.UnityScenePostProcessor:OnPostprocessScene () (at Library/PackageCache/com.unity.probuilder@5.0.3/Editor/EditorCore/UnityScenePostProcessor.cs:61)
System.Reflection.MonoMethod:Invoke (object,System.Reflection.BindingFlags,System.Reflection.Binder,object[],System.Globalization.CultureInfo)
System.Reflection.MethodBase:Invoke (object,object[])
UnityEditor.Build.BuildPipelineInterfaces/AttributeCallbackWrapper:OnProcessScene (UnityEngine.SceneManagement.Scene,UnityEditor.Build.Reporting.BuildReport)
UnityEditor.Build.BuildPipelineInterfaces/<>c__DisplayClass16_0:<OnSceneProcess>b__1 (UnityEditor.Build.IProcessSceneWithReport)
UnityEditor.Build.BuildPipelineInterfaces:InvokeCallbackInterfacesPair<UnityEditor.Build.IProcessScene, UnityEditor.Build.IProcessSceneWithReport> (System.Collections.Generic.List`1<UnityEditor.Build.IProcessScene>,System.Action`1<UnityEditor.Build.IProcessScene>,System.Collections.Generic.List`1<UnityEditor.Build.IProcessSceneWithReport>,System.Action`1<UnityEditor.Build.IProcessSceneWithReport>,bool)
UnityEditor.Build.BuildPipelineInterfaces:OnSceneProcess (UnityEngine.SceneManagement.Scene,UnityEditor.Build.Reporting.BuildReport)
UnityEditor.BuildPlayerWindow/DefaultBuildMethods:BuildPlayer (UnityEditor.BuildPlayerOptions)
UnityEditor.BuildPlayerWindow:CallBuildMethods (bool,UnityEditor.BuildOptions)
UnityEditor.BuildPlayerWindow:BuildPlayerAndRun (bool)
UnityEditor.BuildPlayerWindow:BuildPlayerAndRun ()
UnityEditor.ShortcutManagement.MenuItemEntryDiscoveryInfo:<.ctor>b__7_0 (UnityEditor.ShortcutManagement.ShortcutArguments)
UnityEditor.ShortcutManagement.Trigger:HandleKeyEvent (UnityEngine.Event,UnityEditor.ShortcutManagement.IContextManager)
UnityEditor.ShortcutManagement.ShortcutController:HandleKeyEvent (UnityEngine.Event)
UnityEditor.ShortcutManagement.ShortcutIntegration:EventHandler ()
UnityEditor.EditorApplication:Internal_CallGlobalEventHandler ()

 

This is really a problem, it's totally preventing the ability to build. Is anyone else having this problem? Has anyone found a workaround?

 

So I've been doing some testing. The ONLY way to fix this is to use the Rebuild Shared Indexes Cache function on all the Probuilder objects in these scenes (the level is split into 10+ scenes, and they contain thousands of Probuilder objects between them, Probuilder is basically our entire level pipeline).

However, after running one build, the error returns on the next attempt to run a build and I have to open all the affected scenes and rerun Rebuild Shared Indexes Cache.

I haven't filed a bug report yet, how do I go about doing that? I can't really include the whole project (it's huge), is there a way I can include only a single scene with the affected meshes without totally breaking all the scripts and stuff in the scene?

 

Okay, filed a report! I'll send you the bug report id.

 

Any updates on this?