How to conditionally format italics without changing other parameters?

I am using conditional formatting to color lines based on a priority value in column A, this works fine.

I would like to add another rule that would italicize the lines that match a specific parameter, without changing the background color the previous rules have set.
When I add this rule, the background color is overridden automatically. If I place the rule after the priority rules, I lose the italics.

Is there a way to change the italicization of a line only, with conditional formatting?

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Author: JS Lavertu