Writer template not found

I have recently upgraded to LibreOffice 6.0 (from 5.0), and now every time I open writer it complains that it can’t find a specific template. As far as I can see the template exists in my home directory under Documents/Templates, but Writer is looking for it in Documents/Documents/Templates (which doesn’t exist, and never has). I’ve tried editing/changing the template path in Options/Paths - makes no difference. Any suggestions as to why Writer keeps looking for a “Documents/Documents/Templates” folder?

Which OS ?

Ubuntu Linux 18.04