Corruption of an imported score

In the attached score, reset all elements positions.
Open the inspector. Select the vertical frame (which contains the title) and change the bottom gap to 0.
Select the text frame (which is below the vertical frame) and change the top gap to 0.
Look at the 3rd page. There is a large gap at the top of the page and the last line is corrupted.

In the line immediately above the corrupted line, move a note up and then down in pitch using the arrow keys. More corruption occurs.

This issue should correct itself when a relayout occurs.