How to reproduce:

# Open the “VertexColorBug.zip” project
# Open the “SampleScene”
# Select the "Square" GameObject in the Hierarchy
# Select any color in the Inspector
# Enter the Play Mode
# Observe the Game view
# Exit the Play Mode
# Select any color in the Inspector
# Observe the Game view

Expected results: The selected color is used in Play Mode and is editable after exiting the Play Mode
Actual results: The color becomes fixed to white when in Play Mode and is not editable after exiting the Play Mode

Reproducible in: 2023.3.0b1
Couldn’t test in: 2021.3.33f1, 2022.3.16f1, 2023.2.4f1 (No “Disable Color Tint“ option in Graph Inspector in Shader Graph Editor)

Reproduced on: Windows 11 Pro
Not reproduced on: No other environment tested

Workaround: Save the Shader Graph Editor screen

Note: The issue appeared when the option to “Disable Color Tint“ was released