Copy-Paste not working with different time signatures in same system

How to reproduce this error:

1- Create a two staves sheet. Example: Violin and Piano;
2- Insert in Violin time signature "C" (4/4) and in Piano time signature 12/8;
3- Go to the first measure of piano staff (now, in 12/8) and write an arppegio using six semiquaver notes (which takes one tempo of music, lefting three more empty tempos);
4- Everything goes well until here. However, the error begins when you tries to select all the six notes and copy them to clipboard. Try doing it;
5- Now, paste them in the same measure, in the second tempo, or in any place of this piano 12/8 staff;
6- The pasted notes will be totally crazy. There is no way of copying and pasting in this scenario.

My system: Mac OSX 10.7.5 (Lion);
Musescore 2.0.1.