Demodulate operator not working with CSK SpotLight


I’m trying to use the predefined SpotlightCoregistration graph to coregister two COSMO-SkyMed SpotLight images. It shows this error and doesn’t run:

Error: [NodeId: Demodulate] Only spotlight mode supported

However my two input images are actually spotlight images, as one can see in the screenshot above from the filenames that both contain _S2_, which stands for SpotLight-2. Am I doing something wrong?