How to reproduce:
1. Create and open a new project
2. Create a folder in the Project tab
3. Import any file by dragging it from an external directory onto the newly created folder in the Project tab
4. Observe the Project tab while dragging and hovering over the folder

Expected result: The hovered folder name is highlighted in a blue outline
Actual result: The hovered folder name is not highlighted in a blue outline

Reproducible in: 2023.3.0b10, 6000.0.28f1, 6000.1.0a5
Not reproducible in: 2021.3.46f1, 2022.3.53f1, 2023.3.0b9

Reproduced on: Windows 11 Pro (23H2), macOS 14.4.1 (M2)
Not reproduced on: No other environment tested