1) Clone [https://github.cds.internal.unity3d.com/unity/stw-20-2-cannon-fodder-3-style-game]. Update to [https://github.cds.internal.unity3d.com/unity/stw-20-2-cannon-fodder-3-style-game/tree/bugs/1281021]
2) Open the project with the Windows Editor from [https://saihai.hq.unity3d.com/build/1275] or build using rev e2067236bd5c (2020.2/staging).

Observe the endless spam of errors

Shader properties can't be added to this global property sheet. Trying to add _GrabTexture (type 3 count 1)
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

The user can't click the error and get taken to the offending shader, it will just open up the

Expected behavior: the user is taken to the shader / script where the offending property is set.

Public Issue tracker:
https://issuetracker.unity3d.com/product/unity/issues/guid/1281021/