Steps to reproduce:

1. Create a new Unity project
2. Add an empty game object to the scene
3. Add a script to the game object
4. Add the following line in {{{}Start(){}}}: {{AssistiveSupport.activeHierarchy = new AccessibilityHierarchy();}}
5. Build the project on Windows 10
6. Turn Narrator on
7. Run the application

Actual results: The application crashes with the following message:

 
{code:java}
Exception code: 0xc0000409 STATUS_STACK_BUFFER_OVERRUN
In module: ucrtbase.dll
Call stack:
> ucrtbase.dll!00007ff907aa286e()
ucrtbase.dll!00007ff907a786dd()
ucrtbase.dll!00007ff907a45a0c()
UIAutomationCore.dll!00007ff8c9323bcb()
UIAutomationCore.dll!00007ff8c92ebaa1()
UIAutomationCore.dll!00007ff8c92eb9ea()
UIAutomationCore.dll!00007ff8c92eb82b()
UnityPlayer.dll!00007fffec0e8286()
0000029eea00f74a()
0000029eea00f68b()
0000029eea00f469()
0000029eea00ee0b()
0000029eea00e853()
0000029eea01ffd3()
0000029ee8e65ed8()
mono-2.0-bdwgc.dll!00007fffeae06e7e()
mono-2.0-bdwgc.dll!00007fffead48874()
mono-2.0-bdwgc.dll!00007fffead48960()
UnityPlayer.dll!00007fffebd52a69()
UnityPlayer.dll!00007fffebd46289()
UnityPlayer.dll!00007fffebd46a65()
UnityPlayer.dll!00007fffebd47d4f()
UnityPlayer.dll!00007fffeb9b39d3()
UnityPlayer.dll!00007fffebb81b7d()
UnityPlayer.dll!00007fffebb81d44()
UnityPlayer.dll!00007fffebb821be()
UnityPlayer.dll!00007fffebdd78a4()
UnityPlayer.dll!00007fffebdd9e2d()
UnityPlayer.dll!00007fffebddcc79()
UnityPlayer.dll!00007fffebddcefb()
AccessibilityTesting.exe!00007ff73c7011f2()
kernel32.dll!00007ff908f97374()
ntdll.dll!00007ff909efcc91(){code}
 

Expected results: No crash appears.

Reproducible with versions: Unity 6000.3.0a5, Unity 6000.3.0b8, Windows 10

Not reproducible with versions: Windows 11

Tested on (OS): Windows 10, Windows 11

Notes:

• User report on Unity Discussions