Wrong barlines when removing the second staff

Nightly, August 2 / Windows 7

1) Open "Promenade"
2) Press I key
3) Select Staff 2 (bass clef) -> Select "Remove" -> Ok

Result: the barlines of the staff 1 are halved.

Workaround: Select the first barline -> Ctrl + E -> Stretch the length -> Release -> Escape-> result: all the barlines have recovered their length

- Same result in new scores for keyboard, harp etc.

- The result is correct in the inverse case (removing the Staff 1)