To reproduce:

• Open Unity and create the new "3D URP" project;
• Install the "Sequences" package from the Package Manager;
• Open the Sequences Assets window;
• In the Sequence Assets window press the "+" button and select the "Create Character" option;
• Repeat the 4th step several times;
• Collapse the Character List in the Sequence Assets window;

Expected result: The Character List collapses without any issues;
Actual result: The Character List collapses but breaks other Lists' icons - Fx, Lighting, and other Lists' icons are replaced with the Prefab icons;

Notes:

• When you expand the Character List, some broken icons restores to the original ones, but until you collapse that list again;
• It might be reproducible with other Lists in the Sequence Assets window as well;

Reproducible in Sequences 2.0.0-pre.2
Not reproducible in Sequences 2.0.0

Reproducible in Unity 2022.2.0b7, 2022.2.0b8, and 2023.1.0a10