Grace note glissando (at start of imported 2.x score) disappears
OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 126.96.36.19948, revision: cb404f9
Open the attached score and take the reset. Compare the score in MS 3.x with the same in MS 2.x. There was a bug in 2.x which meant that a glissando applied from a grace note at the beginning of a score broke the layout of the first system. When the same file is imported into MS 3.x, the glissando disappears.