MuseScore 3(.0.1): Additional clefs appear after section break in imported MuseScore 2 file

In a MuseScore 2 file opened in MuseScore 3(.0.1), suddenly, after a section break, a second pair of small clefs appear behind the clefs at the beginning. An example file is attached.

OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 3.0.1.5087, revision: 06a66a2