Tablature not rendering when tune range exceeds highest note

[miesvanderrobot]

The expected behavior, according to the ABCjs site: "If a note is out of range a question mark will be printed instead."

What actually happens: Tune is rendered, but all of the tablature is not.

{
  "tablature": [{
    "instrument": "mandolin", 
    "label": "Tenor Guitar (%T)", 
    "tuning": ["C,", "G,", "D", "A"],
    "highestNote": "B"
  }]
}
---
X:1
T: Cooley's
M: 4/4
L: 1/8
R: reel
K: G
|:D2|EB{c}BA B2 EB|~B2 AB dBAG|FDAD BDAD|FDAD dAFD|