This is because the {{N/A}} template (and many of the other elements in that table) declares its own explicit inline background color (#ececec) and explicit text color (#2c2c2c).
Our Dark mode logic attempts to guess which table backgrounds can be safely removed, but is unfortunately sometimes not 100% successful.

Our general recommendation is to discourage using explicit (hard-coded) background and text colors in templates, unless absolutely necessary. And if the element really does require a specific background color, you can add a CSS class called notheme, which will exclude it from the Dark mode transformation.

In the case of the {{N/A}} template, the hard-coded text color can probably be removed without any perceptible difference.