Operating system: MacOS Catalina 10.15.7
Graphics card: No graphics card
Short description of error
Shouldn't the shadow catcher planes block the sunlight instead of letting it pass through?
Exact steps for others to reproduce the error
Create a room, carve out windows, assign material and use HDRI to light the scene.
Add the objects on the floor and walls.
Make all objects created in step 1 "Shadow Catcher"
Render the scene.
Here's the rendered image. Please notice the strong shadow cast by the paintings and directly underneath the monkey.
Removing the shadow catcher attribute from the wall, ceiling and floor planes, I see this rendering below wherein the shadow seems consistent.
Based on the default startup or an attached .blend file (as simple as possible): The blend file is available here as well: https://drive.google.com/drive/folders/1hp8JSoKK4ISykngS6NSBOttygp4bX-7K