zbarimg unable to parse a QR code that are parseable by iPhones

[hq6]

Here are two different QR Codes of the a string consisting of 1000 repeated 'a''s.

Sample A

Sample B

Sample A is parsable by zbarimg.
Sample B is parsable by every iPhone I've tried but not by zbarimg, which produces the following output when I try to parse it:

scanned 0 barcode symbols from 1 images in 0.2 seconds

WARNING: barcode data was not detected in some image(s)
Things to check:
  - is the barcode type supported? Currently supported symbologies are:
    . EAN/UPC (EAN-13, EAN-8, EAN-2, EAN-5, UPC-A, UPC-E, ISBN-10, ISBN-13)
    . DataBar, DataBar Expanded
    . Code 128
    . Code 93
    . Code 39
    . Codabar
    . Interleaved 2 of 5
    . QR code
    . SQ code
  - is the barcode large enough in the image?
  - is the barcode mostly in focus?
  - is there sufficient contrast/illumination?
  - If the symbol is split in several barcodes, are they combined in one image?
  - Did you enable the barcode type?
    some EAN/UPC codes are disabled by default. To enable all, use:
    $ zbarimg -S*.enable <files>
    Please also notice that some variants take precedence over others.
    Due to that, if you want, for example, ISBN-10, you should do:
    $ zbarimg -Sisbn10.enable <files>