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The files you sent are

The files you sent are monochrome tiffs, I do not have any idea what I could see from these files.

With LibRaw 0.20: both for Canon 2000D/1500D and Canon 1200D files, imgdata.idata.filters is 0x4b4b4b4b

I do not see any problem with colors when demosaicing using LibRaw::dcraw_process().

BTW, in your code i see:
g_snprintf(fit->row_order, FLEN_VALUE, "%s", "BOTTOM-UP");

Is there any possibility that this results in bayer pattern use from the bottom row, not top?

-- Alex Tutubalin