The import was completed successfully. The imported topics still remain uncategorised though. I had a look at the support ticket at https://bbpress.trac.wordpress.org/ticket/2380 . I tried the repair tool, but it did not work too. I had a widget on my theme’s sidebar which displayed the recent posts feed from the forums. The topics were visible there too.
I am ready to take the pain to categorise the topics themselves. Is it in an importer bug that the topics were not categorised? How can I categorise them manually?
Best Regards