UI Document child GameObjects disappear from Hierarchy after exiting Play mode with Hierarchy Integration enabled

Unity: UI Toolkit Framework

Cannot Reproduce

6.6.X

6.5.X

6000.5.0a5 onwards

Thank you for reporting a bug to Unity. We have investigated the issue but were unable to reproduce it with the information provided. This can happen due to differences in environment, project setup, or steps taken. We will close this case for now. If you're able to share additional details such as different projects, steps, hardware/software configuration, or logs - please let us know, and we'll be happy to re-evaluate.

Reproduction steps:
1. Create a new project and make sure new Hierarchy window is enabled
2. Enable Hierarchy Integration in Project Settings (Edit > Project Settings… > UI Toolkit)
3. GameObject > UI Toolkit > UI Document
4. Enter and exit Play mode
5. Observe UIDocument GameObject in the Hierarchy

Actual result: All GameObjects under UIDocument disappear
Expected result: All GameObjects under UIDocument remain visible

Reproducible with: 6000.5.0a5, 6000.5.0a6
Not reproducible with: 6000.3.7f1, 6000.4.0b7, 6000.5.0a4
Couldn’t reproduce with: 6000.0.66f2 (No Enable Hierarchy Integration option)

Reproduced on: macOS Sequoia 26.2 (M4)

Note: Disabling and reenabling Enable Hierarchy Integration option makes GameObjects reappear

UI Document child GameObjects disappear from Hierarchy after exiting Play mode with Hierarchy Integration enabled

Unity: UI Toolkit Framework

Cannot Reproduce

Prioritise and Follow this issue

Have a workaround or additional info about this issue?

UI Document child GameObjects disappear from Hierarchy after exiting Play mode with Hierarchy Integration enabled

Unity: UI Toolkit Framework

Statuses

Cannot Reproduce

Resolution Notes

Description

Prioritise and Follow this issue

Have a workaround or additional info about this issue?