How to reproduce:
1. Open the attached project “devs-sequences-uitoolkit_repro.zip”
2. Open UI Toolkit Sequences window (Window > Sequencing > Sequence Assets (UI Toolkit))
3. Click on the drop-down arrow next to the “NewSequenceAsset”
4. Open Project window and go to Assets > Sequence Assets
5. In the Project window, duplicate any “NewSequenceAsset Variant” Prefab

Expected result: drop-down arrow in the UI Toolkit Sequences window remains grey
Actual result: drop-down arrow in the UI Toolkit Sequences window turns blue

Reproducible with: 2022.1.0b8, 2022.2.0a4
Could not test with: 2019.4.36f1, 2020.3.29f1, 2021.2.12f1 (Sequences package errors)

Notes:
- Reproducible on macOS and Windows
- The issue also reproduces after removing items or docking the window