Incorrect User Count Displayed in Badge for GitHub Action Usage

[MathieuSoysal]

Introduction

Currently, I'm programming a GitHub Action to facilitate the publishing of JavaDoc to a static web page.

The GitHub repo link of the GitHub Action: https://github.com/MathieuSoysal/Javadoc-publisher.yml

In this project I have this badge to show how many GitHub project uses the GitHub Action.

URL of the badge:

https://img.shields.io/endpoint?url=https%3A%2F%2Fapi-endbug.vercel.app%2Fapi%2Fgithub-actions%2Fused-by%3Faction%3DMathieuSoysal%2FJavadoc-publisher%26badge%3Dtrue

The badge uses this data:

https://api-endbug.vercel.app/api/github-actions/used-by?action=MathieuSoysal/Javadoc-publisher&badge=true

Here is the source code of this service: https://github.com/EndBug/api/blob/main/api/github-actions/used-by.ts

Problem

The badge shows 8 users of GitHub Actions but in fact, is 64.

Question

Does someone know how to fix this to show how many repos use a GitHub Action?

[EndBug]

This seems to be a bug with GitHub's API, with the fork parameter of their code search endpoint: fork:true is supposed to include forks in the search, but instead it seems like it's only searching forks (which should be fork:only, according to the docs.
I will open an issue.

[EndBug]

I've reported the issue here: https://github.com/orgs/community/discussions/64791