This problem has been persistent for a while, just happens every so often at random times, nothing changing. I also do not know how to reproduce the problem, but I\'ll give a de
This happens, indeed, in my case simply Ctrl+X, waiting for a second, and then pasting the formula back makes the Sheets engine re-do the import and then it succeeds to import.
In case you can not do this procedure manually, you should use Tim's solution.