No character preview with player pawn mod

I’m working on a personal-use mod that replaces the player pawn, but during in-game testing, the character preview display never appears. The game appears to load perfectly normally, and then just shows the preview view of The Island (which is normally the backdrop to the character preview), but without any UI over it.

I copied over the playerpawn_test, playerpawn_female, and playerpawn_male files, reparented the latter two to my custom playerpawn_test file, and then changed the references in the primalgamedata gender definitions. Is there some other step that I’m missing?