Air Zonk shows a blue line at the top border.

[SegaSnatcher]

Version (or build number)

0.2.1

Steps to reproduce

Start first level and scroll character all the way to the top.

Expected Behavior

Air Zonk should only show a dark olive green border at the very top.

Actual Behavior

A blue line appears in the top border area.

The blue line goes away when you press pause.

Additional Context

The MiSTer core, which is the core used in this port, does not have this issue.