[Physics.PhysX] QuickHullConvexHullLib::findSimplex: Simplex input points appers to be coplanar.

I create a Quad, and set its Transform as follows：
position (306.2141, -94.32835, 378.1256)
rotation (31.305, -86.606, 90.394)
scale (11.69272, 100.1775, 15.23574).
When i check “Convex“ propertie on Mesh Collider Component,it is no error.
Then i change "Cooking Options" on Mesh Collider Component and check “Convex“ propertie on Mesh Collider Component again, editor pring two error:
1.[Physics.PhysX] QuickHullConvexHullLib::findSimplex: Simplex input points appers to be coplanar.
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)
2.Failed to create Convex Mesh from source mesh "Quad". An internal unspecified error has occured that could mean the Quickhull algorithm found the input mesh topologically challenging.
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)
Final I change Rotation or Scale and check “Convex“ propertie on Mesh Collider Component again, The error disappear.
My Unity version is 2019.3.0f5.
I would like to know the reason for this problem and how I should tell the artists to avoid it

I`m so sorry about my Englis.

 

did you ever found a solution ?

 

bump

 

Had the same Error

Recreating the parent object, which had weird rotations and scalings, did it for me.
Guess it has something to do with parent-child transform relations.