As of 1.19.4 (and by extension, snapshots up to 23w13a), the Recipe Book menu displays a black search bar, where previously it just displayed the "Search..." text. As best I can tell, this change wasn't mentioned in the 1.19.4 release notes, and has the potential to clash pretty harshly with custom GUI textures.

If this is an intended feature meant to increase the Recipe Book menu's overall accessibility, wouldn't it make more sense to have that as a separate setting in the Accessibility Settings menu, instead?

The attached images compare the 1.19.3 and earlier menu (on left) and the 1.19.4 and later menu (on right), in both the Vanilla resource pack and in a custom resource pack.