Expand icon apperars in Media pane when pasting block to block folder and vice versa

Description

Steps to reproduce

1. Copy a block from folder1.
2. Paste it to folder2.
3. Navigate to the Media tab.

Expected: Folder2 in the Media shows normally.
Actual: Folder2 has an expand icon.

Note:

• Same issue occurs when copying media, and switching to the Blocks tab.
• Same issue occurs when dragging and dropping the asset to another folder directly.