Custom text ignores system flag when imported into 3.x
When you create a custom text style in version 2.x, then import the score into version 3.0.1 the system text flag is ignored. When it encounters a custom style, the text needs to be examined to see if it has the system text flag set. In this case, system text needs to be entered into the imported score.
The workaround is to delete all improperly imported text. create a new custom text style, add system text again and select that style in the inspector.