Warning when using Slider whole number

Unity Engine
1

Whenever I check “Whole Numbers” on the UI Slider, and move around the Value handle in the inspector, I get this warning spamming in the console (even in editor mode).

5228159--521354--upload_2019-11-29_17-13-21.png

SendMessage cannot be called during Awake, CheckConsistency, or OnValidate
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)
2

Bump.
So far it seems to not have fixed itself. It also happens on brand new projects.