[unsafe-to-concat] Fix PairPos2 logic Test failures down from 8 to 6: 113/400 harfbuzz:shaping+in-house / mongolian-variation-selector FAIL 0.06s exit status 1 203/400 harfbuzz:shaping+aots / gpos3 FAIL 0.06s exit status 1 204/400 harfbuzz:shaping+aots / gpos4_lookupflag FAIL 0.06s exit status 1 260/400 harfbuzz:shaping+aots / gsub4_1_multiple_ligatures FAIL 0.06s exit status 1 264/400 harfbuzz:shaping+aots / lookupflag_ignore_attach FAIL 0.06s exit status 1 266/400 harfbuzz:shaping+aots / lookupflag_ignore_combination FAIL 0.06s exit status 1