Reproduction steps:
1. Open user's attached project "New Unity Projectmthrt.zip"
2. Open "SampleScene"
3. Click on "Sprite" GameObject in the Hierarchy window
4. In Inspector window -> Click on "Add Component"
5. Search for "Blend Mode" and add it

Expected result: "Blend Mode" component gets added and works properly
Actual result: "Blend Mode" component doesn't get added and Unity hangs up on "Editor.Sprites-Default (Material).OnInspectorGUI" loading pop up

Reproducible with: 2D Sprite 1.0.0 (2020.2.0b3, 2020.2.0f1, 2021.1.0b1)
Not reproducible with: 2D Sprite 1.0.0 (2018.4.30f1, 2019.4.17f1, 2020.1.17f1, 2020.2.0b2)

Note:
Unity hangs up on the following GameObjects:
Static Sprite
Dynamic Sprite
Circular Sprite
and other types of Sprite in 2D

Unity doesn't hang up and component gets added on the following:
Sprite Mask
Cube
Particle system
Audio source
and other GameObjects outside 2D