Input.GetMouseButton breaks when focus is switched

Super simple script:

Code (CSharp):

1. public class MouseTest : MonoBehaviour
2. {
3.     private bool lastHeld;
4.  
5.     public void Update()
6.     {
7.         var isHeld = Input.GetMouseButton(0);
8.         if (isHeld != lastHeld)
9.         {
10.             Debug.Log($"Frame: {Time.frameCount}, Held: {isHeld}");
11.             lastHeld = isHeld;
12.         }
13.     }
14. }

Steps to recreate:
1. Run game
2. Click (value changes to true ✅)
3. Release -> (value changes to false ✅)
4. Click clear in editor log below (losing focus on game)
5. Click back in game (value changes to true, then false next frame! ❌)

 

Hi,
I'm having the correct behaviour and can't reproduce.
I'm running 2019.4.13f1, what's your Unity version?

 

I'm running 2020.2.1f1 on Windows 10 Home.

 

Just an addendum:

Clicking outside the unity editor window does not cause the bug. (e.g. on the windows desktop)
Clicking on other Unity editor components does (e.g. on an inspector window)