Undo multiple times doesn't work

[NeoCoderMatrix86]

Describe the bug
Undoing changes multiple times does'nt work. If you bulk edit tracks, set the length and undo, the undo is not always done.

To Reproduce
Steps to reproduce the behavior:

1. Add 3 tracks
2. Select all 3
3. Bulk edit them and set length to 00:02:00
4. Undo
5. Redo
6. Undo
7. Track 2 has end of 00:04:00

Expected behavior
Track 2 should also have end = null.

Screenshots

[NeoCoderMatrix86]

It's a problem with sequence. The first undo resets end of all tracks and afterwards sets the begin.