Reproduction steps:
1. Open the attached project "ShaderGraphTextureUpdate.zip"
2. Open the "New Shader Graph" Shader Graph
3. Right-click on the texture "Ground_Albedo.tif" in the Project Window and select "Reveal in Finder"
4. Delete the "Ground_Albedo.tif"
5. Duplicate the "Ground_Albedo_2.tif" and rename it to "Ground_Albedo.tif"
6. Go back to the Editor
7. Right-click on the texture "Ground_Albedo.tif" in the Project Window and select "Reimport"
8. Observe the "New Shader Graph" Shader Graph

Expected result: The texture "Ground_Albedo.tif" in Shader Graph updates
Actual result: The texture "Ground_Albedo.tif" in Shader Graph isn't updated

Reproducible with: 7.7.1(2019.4.30f1), 10.6.0(2020.3.18f1), 11.0.0(2021.1.21f1) 12.0.0(2021.2.0b12, 2022.1.0a8)

Notes:
- Workaround is to close the Shader Graph and open it again
- Also reproducible on Windows