Cannot get line or timeline graph to show as a line. Only shows as Area

[Jeefongithub]

I'm working on a basic graph with one column being date and one column being a number. I'd like to use a timeline chart where no area below is shaded but it appears the chart for timeline and line are displaying similar to how the Area chart is displaying

Examples:
Line

Timeline

Area

Environment Info
Debian 12
Apache, php 8.3
Nextcloud 29.0.1
Analytics 5.0.1
Tables 0.8.1

[Rello]

Hi,
this is a default handling when there is only one data series. you can disable it by adding the following to the "Data options":

{"0": {"fill":"false"}}

but there is a bug why this is currently not working. will be fixed with the upcoming update