Broken: 2.82 (unknown which revision, custom build without buildinfo)
Short description of error
Viewport is not updated for a material that is driven by a VSE driver.
Exact steps for others to reproduce the error
Changing the VSE strip opacity doesn't update the viewport.
More info from user
I am creating an addon to transform eevee into a VSE. I encountered several problems, and one is that by changing the values "chanel", "opacity" or moving the strip (it should disappear). the changes are not visible until the 3d view is moved. Just there it is updated. This makes it uncomfortable to work with the addon. The only change that works well is when changing the resolution X of the render, when playing the video or scrolling through the timeline, everything looks correctly.
Everything is being controlled by drivers.