A reply from the Fujifilm Service Team in Germany explains that they are aware of this problem. It seems to be a function of LR's recognition of Fujifilm profiles which apparently exist. That's understandable since image metadata shows proper camera, lens and exposure details. Fujifilm had already informed Adobe development teams, but nothing has been corrected yet (which I noticed).
I'll contact Adobe and see what they can offer. The camera has been on the market for a number of years, so Adobe development folks have had enough time to implement a solution.