Ugin, I downloaded your demo file and can clearly see the error, but it works for me in an April 27th and May 7th test builds on Fedora.  We will test on Ubuntu 18 later today using the April 30th build as we do not want this potential bug to go into the May 31 builds.  Meanwhile, if anyone else reproduces this, please let us know as it would be bad.  GG did fixgg/Phyllis