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ColorRamp doesn't update when a color stop is driven by expression
Closed, ResolvedPublic

Description

System Information
Operating system: Win10
Graphics card: 2x1080 Ti

Blender Version
Broken: 2.80, 54ffc4e19dc4

Short description of error
The ColorRamp node works perfectly when animated directly, but when I link the position of one of the "color stops" to a custom prop, it doesn't update in the viewport. It still updates the value in the color node itself and it will render fine.

I provided a sample file with two planes both have the basically the same shader (a linear gradient) applied. The only difference is that one ColorRamp is animated with keyframes on the left black stop, while the other is driven by an expression.