Converting fonts to C yields a bunch of <value not defined> fields

[OpusElectronics]

Context: Revision 4d43872 from 2022-06-23 22:11:57 +0500 Qt 5.15.16 Linux

Monochrome fonts

All character images generate something like:

static const tImage Font_0x7d = { image_data_Font_0x7d,
    <value not defined>, <value not defined>, 8};

Likewise, font arrays have this kind of entries:

{0x21, &Font_0x21, <value not defined>, <value not defined>, 4, 20 },

What could be the cause?