Problem appearing after updating from previous stable (a week before) to Moodle 2.2.1+ (Build: 20120217)

Lesson start
1. Branch (or content) page (jump "next page")
2. Branch (or content) page (jump "next page")
3. ... (jump "next page")
4. Cluster start (jump to "unknown question in cluster")
4.a. Question (jump "cluster")
4.b. Question (jump "cluster")
4.c. Question (jump "cluster")
4.d. ... (jump "cluster")
5. Cluster end (jump "next page")
6. Branch (or content) page (jump "next page")
7. Branch (or content) page (jump "next page")
8. ...(jump "next page")
9. Cluster start (jump to "unknown question in cluster")
9.a. Question (jump "cluster")
9.b. Question (jump "cluster")
9.c. ...(jump "cluster")
10. Cluster end (jump "next page")
11. Branch (or content) page (jump "next page")
12. Branch (or content) page (jump "next page")
Lesson end

Two problems occur:
• IF no. 5 set to jump "next page" it automatically jumps to the lesson end.
• If no. 5 set absolute jump to no. 6, cluster starting in no. 9 is traversed, but on cluster end (no. 10) it automatically jumps to no. 1 and does not enter any cluster anymore but loops in no. 1, no. 2 and no. 3 indefinitely.