Glissando across system is not drawn correctly when auto placement increases staff distances

Steps to reproduce:
1. Create a score with two instruments.
2. Add a system break. Then, in the staff for the second instrument, add two notes and a glissando across that system break.
3. between the two staffs, add a block of text or other objects so that the staff distance is increased. (Auto placement needs to be active.)

Expected result:
The direction of the glissando line is not changed.

Actual result:
The direction of the glissando line changes. The more the staff distance is extended, the more apparent the bug is.

Operating system:
Windows 10 Home, Ver. 1803

Some notes:
1. The bug also appears for any system with more than one instrument (as in the case in the attached file).
2. The workaround is to hand-adjust the glissandi. However, the precision of such action is not very high.