I can reproduce this bug in Windows 10, Inkscape 0.92.3 (2405546, 2018-03-11).
In fact it happens to me all the time when working with closed BSpline shapes. I made another bug report recently that I now realize is a duplicate of this one: https://bugs.launchpad.net/inkscape/+bug/1762093
If this is a precision issue would using much larger shapes fix (or at least avoid) it? I tried scaling up the shape in the provided svg and can no longer reproduce the bug. For now this appears to be a promising workaround!
I can reproduce this bug in Windows 10, Inkscape 0.92.3 (2405546, 2018-03-11).
In fact it happens to me all the time when working with closed BSpline shapes. I made another bug report recently that I now realize is a duplicate of this one: https:/ /bugs.launchpad .net/inkscape/ +bug/1762093
If this is a precision issue would using much larger shapes fix (or at least avoid) it? I tried scaling up the shape in the provided svg and can no longer reproduce the bug. For now this appears to be a promising workaround!