In CC 2018, it was possible to animate a material on a 3D object. I am unable to do so on 20.0.4.
The test setup is really straightforward: 1) Create a new, blank 1000 px square document 2) Create a new 3D mesh preset from layer, and make a sphere. 3) Create a new video timeline. 4) Double-click on the sphere's material in the Layers panel to open it. 5) Add a layer, and draw a line on the layer. 6) Create a video timeline, and keyframe the position of the "line" layer. 7) Move the play head to another position and move the "line " layer to create a short animation. 8) Save and close the material.
On CC 2018, I could scrub the video timeline and watch the line move on the surface of the sphere.
On CC 2019, when I scrub the timeline, the animation in the material does not play. Exporting the rendered video also does not include the material animation.
This constitutes a major loss of functionality in the 3D area of Photoshop.