tab - wrong bar duration? wrong note stem?

[bb]

\version "2.16.2"

\new TabStaff <<
  \set TabStaff.tablatureFormat = #fret-number-tablature-format-banjo
  %\set TabStaff.stringTunings = #banjo-open-g-tuning
  {
    \tabFullNotation
    \stemDown
    g8 a2 b8 c
    a4 b2 c8 d
  }

>>

If you try this example you will see

1. the note stem (or tail) of the half notes are double

2. the bar line will be set wrong! The first bar has 3 eightth note, one 
quarter note and a half note, makes 9 eighth!

3. this error happens with Banjo tabs as well.


Regards

BBlochl