Copy / paste changes tied-to notes in presence of accidentals

Windows 7, GIT commit: c7b7d35

1) new score, for flute, C major, 4/4, >1 measure
2) note entry node
3) 5 D D Down + (to enter quarter note D, quarter note Db tied to another)
4) exit note entry mode
5) select measure
6) copy, paste to another measure

Result: the second (tied) Db has (visually) turned into a C
Expected result: copy should be identical to original; Db should be tied to another Db