A system-attached text object with a paragraph style that has Align with systemic barline if at start of system checked will be correctly aligned. But once the project is saved, closed, and opened again, the text is no longer aligned correctly and appears as if the box was unchecked. This can be fixed by opening Paragraph Styles, unchecking the box, clicking OK, then opening Paragraph Styles again and checking the box again. The text remains aligned correctly until the project is closed and opened again.
This bug only occurs with system-attached text. Staff-attached text behaves as expected. The bug is reproducible from a new blank project in v.126.96.36.1994.