Neon Visual Glitch with One Staff Line

[DeannaLC]

(From Rodan #1284)

I've been trying to use Neon for visualizing MEI outputs, but it seems when I have a file where @staffDef lines=1, there's a pretty bad visual glitch that covers the whole page. This seems to occur both in Rodan's Neon and the standalone DDMAL Neon.

Here's what it looks like with lines=1:

Same folio with lines=4:

MEI files used:
one_line_mei.zip
multi_line_mei.zip

015v Folio