Slur positioning bug in 2nd, 3rd and 4th voices

If a slur is entered by typing after the first note of the phrase and typing again after the last note of the phrase in other voices than the first, the slur ends too far to the right instead of on the note. Selecting the first and last notes of the phrase, then typing , works as expected with the slur's end positioned correctly. Selecting the slur by double-clicking and then adjusting the anchor with + to the right or left and then back again also solves the problem. It doesn't always occur, so I haven't been able to reproduce the bug reliably, but I am still testing and searching. Attached is a test page in which the fault occurred in all three voices except the first in both staves of the grand staff. I also added slurs by selecting the start and end notes and then typing for reference.