3D grid filter: Missing Polygon filter object in Project Tree

Steps:
1) Create a polygon
2) Create Filters/Polygon filter
--> polygon filter item not shown in Project Tree

Linux, version 2026.06.1.

<img width="1450" height="942" alt="Image" src="https://github.com/user-attachments/assets/5fd46a48-3184-4e8a-92b6-85059a59a15b" />