The voronoi texture node only sets the first 3 components of the color. The alpha value is never set. Normally this is covered when using it in a shader node, but when directly connected to the AOV output, the color was stored as a pure emissive color. This resulted in incorrect colors in the viewport and image renders. This is a partial fix for #118494 Pull Request: https://projects.blender.org/blender/blender/pulls/118497