MissingReferenceException errors are thrown after entering Play mode when multiple Inspector windows are displaying different objects with Grid Layout Group component

Unity: UI Toolkit Controls

In Progress

6.5.X

Fixed

6.7.X

6000.7.0a2

6.6.X

6000.6.0b3

6.3.X

6000.3.0a5 onwards

6000.3.19f1

Won't Fix

6.4.X

End of life

Steps to reproduce:

Open the attached project
Open the Sample Scene
Select the Panel object in the Hierarchy
Lock one of the Inspectors
Select the Panel (1) object in the Hierarchy
Enter Play mode
Observe the Console window

Actual results: Multiple MissingReferenceException errors are thrown

Expected results: No warnings or errors are thrown when using multiple Inspector windows to view different objects with the Grid Layout Group component

Reproducible with versions: 6000.3.0a5, 6000.3.18f1, 6000.4.12f1, 6000.5.0f1, 6000.6.0a7

Not reproducible with versions: 6000.0.77f1, 6000.3.0a4

Tested on (OS): macOS 26.5.1, Ubuntu 24

MissingReferenceException errors are thrown after entering Play mode when multiple Inspector windows are displaying different objects with Grid Layout Group component

Unity: UI Toolkit Controls

In Progress

Fixed

Won't Fix

Prioritise and Follow this issue

Have a workaround or additional info about this issue?

MissingReferenceException errors are thrown after entering Play mode when multiple Inspector windows are displaying different objects with Grid Layout Group component

Unity: UI Toolkit Controls

Statuses

In Progress

Fixed

Won't Fix

Resolution Notes

6.4.XWon't FixEnd of life

Description

Prioritise and Follow this issue

Have a workaround or additional info about this issue?