Can someone tell me where this screen-aligned tiled flicker comes from in HDRP?

I've been testing the new Decal master node in HDRP and encountered the issue you can observe above: chunks of a surface rendered with a graph utilizing that node flicker in and out in screen-aligned squares. I verified it has nothing to do with z-fighting (already adjusted relevant properties of the material and shifted underlying surface around), so it must be something else. Screen-aligned flicker in perfectly even squares is especially weird - as if it was some sort of an issue with tiled rendering.

The issue only happens when opacity inputs of the Decal master node are filled with an alpha value sampled from a texture - leaving them at constant 1 and disconnected from the graph makes the artifact disappear. Since the artifact appears even over areas with exact texture alpha value of 1, I doubt this has anything to do specifically with the structure of my graph - it might just be a shader generation bug.