Would you mind providing me with the material you are using? Perhaps this is what is causing your issue. Check within the Usage settings of your material and see if you are checking the right boxes for how the material is actually being used within your scene.
I just recalled there is a setting within your ‘Project Settings’ within the ‘Rendering’ section to toggle using ‘Normal Maps for Static Lighting.’ Try disabling this setting to see if this is the fix you are looking for.
Normal Maps Used for Static Lighting
Thank you,