Tuplet creation sometimes operates on previous instead of next note in note input mode

By which I mean, normally in Note Input mode, creating a tuplet affects the notes about to be entered while leaving the existing notes alone. But the Other option affects the most recently entered note.

Steps to reproduce:

1) Create new score, 4/4 time
2) Enter notes in first measure: 5, C, 6, Notes / Tuplets / Triplet
3) This creates quarter note C followed by a quarter note triplet
4) Move to second measure
5) Enter notes 5, C, 6, Notes / Tuplets / Other, accept default of 3/2

Expect result: same as described in 3) above: a quarter note triplet is created after the initial C
Actual result: the initial C is changed into an eighth note triplet

Tested on Windows 7
GIT commit: 3543170