Custom header per tag page

I think I actually figured it out.

If you go to the Edit Tags option for a post/page (if you have the plugin that enables it for both), the Header options will be there. I assume that if I want to apply a specific heading to multiple tags, I have to go into EACH of those tags and pick that header, so if someone clicks on a menu link that is a tag search/archive page for BOTH tags A and B, A and B’s headers must be the same.

I hate to bump, but alas, I can’t edit my former posts.

So while I was able to assign a specific header to each individual tag, the links that I have, which are meant to find ANY posts with tag A OR B OR C, ends up finding the post all right, but still displays the default header.

But if I go to https://sailormoon.seventh-star.net/tag/fashion

or https://sailormoon.seventh-star.net/tag/costumes

The correct post AND header shows up.

Does the WP Display Header plugin not recognize the commas in a tag archive, e.g. Tag A OR Tag B?