I somehow solved the problem - kind of. The data set on which I ran the GAM model contains many more variables than are needed in the model, so I created a new data set in R and reran the GAM model on the slimmed down data set. Same problem: The GAM can be computed, but the tensor product cannot be plotted. I then saved the slimmed down data set as a CSV file, reread it into R, computed the model once again, and lo and behold: I can now plot the tensor product. Any ideas why?
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