Reproduction steps:
1. Create a new project
2. Create any Standard Element (GameObject > UI Toolkit > Standard Element)
3. Create UI Document and exit Visual Tree Asset context
4. Enter Play Mode
5. Click “Open Visual Tree Asset in context” button in newly created UXML Template GameObject in Hierarchy window
6. Observe the Console
Actual result: "Internal: deleting an allocation that is older than its permitted lifetime of 4 frames (age = 5)" warning is thrown
Expected result: No warnings or errors are thrown
Reproducible with: 6000.6.0b1, 6000.7.0a1
Couldn’t reproduce with: 6000.0.76f1, 6000.3.18f1, 6000.5.1f1, 6000.6.0a7 (No “Open Visual Tree Asset in context” option)
Reproduced on: macOS Tahoe 26.5 (M4)