Fails to import module jbCGoMdf.js on init

[ShadowCrafter011]

I want to integrate dice box with Ruby on Rails 7 so I pinned @3d-dice/dice-box using importmap bin/importmap pin @3d-dice/dice-box and moved the assets folders to public/dice-box/.

Using Stimulus I initialised dice box like this:

import { Controller } from "@hotwired/stimulus";
import DiceBox from "@3d-dice/dice-box";

// Connects to data-controller="norisknofun"
export default class extends Controller {
    async connect() {
        this.diceBox = new DiceBox("#dice", { assetPath: "/dice-box/" });
        await this.diceBox.init();
        // this.diceBox.roll("2d6");
    }
}

The new DiceBox expression works and it creates the canvas as expected in div#dice. However await this.diceBox.init() throws the following error: Uncaught (in promise) TypeError: Failed to fetch dynamically imported module: https://domain.com/_/jbCGoMdf.js.

Now I'm at a loss of what to do as I couldn't find a file with that name anywhere. Neither in node_modules nor anywhere else in the project.