There was a Darktable code revision 2 years ago following the bug I reported https://redmine.darktable.org/projects/darktable/repository/revisions/b939ed9d49322aa7d5eb27309677419e4fc31d10
When it was fixed I had compiled v2.3+xxxxxx and continued using it until now. This time, two years later, when I upgraded to 2.6, hoping for good, DT showed me the old error again ‘cannot read Nikon J1 camera balance’. The stranger part is that WB is perfectly read for neighbor images of the same photo series. It fails to read WB like for every third-fifth file or so.
In order to test, I removed my library.db and data.db, as well as ./config/darktable, suspecting my old configs to be corrupted and pulled DT v2.6 from Ubuntu repository, installing new configs, but, no, it wasn’t them configs - the error repeated itself.
I wonder where did do wrong? Was the fix transferred to subsequent DT versions >2.3?