How to reproduce:
1. Open attached "TestingOpenGL.zip" and Scenes/SampleScene scene
2. Make sure that Graphics API is set to OpenGLES2
3. Select the Cube Game Object
4. Select Rotate tool and try rotating (or perform any other transformation)
5. Observe the Scene view and errors in the Console window

Expected result: Scene view remains stable and no errors appear
Actual result: Scene view is corrupted and errors appear in Console window

Reproducible with: 2020.2.0a9, 2020.2.0b10, 2021.1.0a4
Not reproducible with: 2018.4.28f1, 2019.4.14f1, 2020.1.12f1, 2020.2.0a8

Notes:
1. Graphic APIs tested: Direct3D11, Direct3D12, Vulkan, OpenGLCore, OpenGLES2, OpenGLES3
2. The error that appears in the Console window:

"Trying to access pass 1, but material 'CircularArc' subshader (0) has only 1 valid passes.
UnityEditor.Handles:DoPositionHandle_ArrowCap (int,UnityEngine.Vector3,UnityEngine.Quaternion,single,UnityEngine.EventType)
UnityEditorInternal.Slider1D:Do (int,UnityEngine.Vector3,UnityEngine.Vector3,UnityEngine.Vector3,UnityEngine.Vector3,single,UnityEditor.Handles/CapFunction,single)
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)"