Font A: 1679 kerning-pairs, only group-kerning; cleaned up and multiple times compressed, exported as .metrics-file.
Font B: all pairs deleted (group and glyph) – 0 pairs. Import .metrics-file (with kerning-groups imported) and get 1676 pairs, three are missing.
If I copy and paste the kerning from font A to font B, I got 1679 pairs. Why is the metrics-file missing some pairs?