Reproduction steps:
1. Create a new project
2. Create UI Document (Create > UI Toolkit > UI Document)
3. Double-click newly created Asset to open UI Builder window
4. Click on “NewUXMLTemplate.uxml”
5. Enable Editor Extension Authoring
6. Drag Mask Element to the Hierarchy and select it
7. Add one Element in the Choices list in Inspector (Attributes > Choices)
8. Set its name to “,” and observe the Element tooltip
Actual result: “UXML attribute: choices
Value: %2C” is displayed
Expected result: “UXML attribute: choices
Value: ,” is displayed
Reproducible with: 6000.1.0a9 (0115cb901a32), 6000.2.8f1, 6000.3.0b6, 6000.4.0a2
Not reproducible with: 6000.0.60f1, 6000.1.0a8
Couldn’t reproduce with: 2021.3.57f1, 2022.3.67f1 (Choices field does not have a list)
Reproduced on: Windows 11, macOS Sequoia 15.4 (M4)