[Bug]: Issue with Warning Panel

[Olatunde-Alalade-ONS]

Describe the bug

When creating a warning panel, I added an optional title field

I expected to see a warning panel however When I rendered the page, the title appeared to be missing
. However closer inspection revealed that the title was being rendered as white text on a white background.

Additionally, the first character of the title was being obscured by the warning icon itself. (See attachments)
. I am informed that the following line is the culprit for the text not being visible:

https://github.com/ONSdigital/design-system/blob/main/src/components/panel/_panel.scss#L48

In the default warning panel style that is white text on a dark blue background - but in the warning panel the dark blue background is removed, but the text is still white.

Expected behaviour / outcome

I expected to see a warning panel however When I rendered the page, the title appeared to be missing
. However closer inspection revealed that the title was being rendered as white text on a white background.

List the steps necessary to reproduce the bug

Creating a warning panel and rendering it. The text disappears.

Additional context

No response

What version of the ONS Design System are you using?

72+

What device(s) are you using?

Desktop, Mobile

What operating system(s) are you using?

Windows

What browser(s) are you using?

Microsoft Edge