Hmm - how was it breaking your application?

I was using this config for the axios from some other apps I built. When I looked on the app.blade.php I saw that the csrf token was being set so I thought I had to do the same thing, use this config. If I don't use the config below and do a normal axios call it works just fine (noticed that after the pull request). That line of code misled me, sorry for bothering (still new to the VILT stack).

const config = {
  headers: {
    "Content-Type": "multipart/form-data",
    "X-CSRF-TOKEN": document.querySelector('meta[name="csrf-token"]')
      .content,
  },
};

Actually, I think this line can safely be removed. Inertia / Axios uses the X_XSRF_TOKEN cookie by default, Breeze doesn't include any code to use the meta tag (as far as I can tell). This is also the proper way to use the csrf token, because the cookie will be updated on every request, the meta tag won't be updated.
You'll also run into issues when trying to use the token from the meta tag, like mentioned above, since that token won't be valid

I dunno - I'm not removing this without more thorough information as to what it is breaking I don't think. I haven't had any other complaints about this breaking stuff since releasing Breeze.

I dunno - I'm not removing this without more thorough information as to what it is breaking I don't think. I haven't had any other complaints about this breaking stuff since releasing Breeze.

It "works" because the token is not being used, problems arise when you do use the meta token, because it's an old token which isn't valid. This tag won't update between requests, so if you'd use this value you'd be sending an old token, causing an CSRF mismatch. Axios uses the cookie value (https://github.com/axios/axios/blob/73e3bdb8835ba942096b662e9441f1d85ce4d484/lib/defaults.js#L117-L118), and not the token defined in the meta tag.

I believe the same reasoning was used to remove the tag from Jetstream laravel/jetstream#878

@taylorotwell seems we indeed did the same for Jetstream?