I upgraded to hplip 3.9.10 and the test page printed fine, whereas the the bottom 1 mm of text on the bottom of the test page under hplip 3.9.8 was missing.
I upgraded to hplip 3.9.10 and the test page printed fine, whereas the the bottom 1 mm of text on the bottom of the test page under hplip 3.9.8 was missing.