I’ve updated to Unity 6 to see if it works as expected. I have a minimap system in the game that uses a render texture with an additional camera to display the minimap. The shadow update setting for all lights in my game is set to ‘On Demand’ mode. However, shadows are not rendering when the GPU Resident Drawer is enabled.
This issue is easy to replicate: create an additional camera, set a render texture in its target texture field, enable the GPU Resident Drawer, and set the shadow update mode for the directional light to On Demand you will notice that all shadows stop rendering.