Scores with pickup measure have last bar wih wrong beat number.
[r.912c592] - Windows xp
1) Create a piano score from template
2) Time signature: 4/4, pickup: 1/8
Result: the last bar has an implicit time signature of 3/8.
The last bar has always a duration 3 times that of the pickup measure.
Maybe (but I don't know for sure) this is related to that fix: #7315: Creating a 1/128 time signature result in 3/0 score