acf/settings/load_json filter not parsing JSON

Hi there,
First, i want to tell you that ACF is an amazing Plugin which helps me a lot..
Now i'm making a plugin which uses ACF
This plugin is supposed to use it's own JSON fields
I added current filter
$this->loader->add_filter('acf/settings/load_json', $this, 'acf_json_load_point');
The JSON file is loaded, and the Sync functionality works great !
BUT
The default exported JSON is found, but not parsed
When i remove the begining array chars "[" and at end "]" it works

This does not works :

[
    {
        "key": "group_5a3c0e1b7d21f",
        "title": "my title",
        "fields": [
            {
                "key"....
   ....
    }
]

But this works :

{
        "key": "group_5a3c0e1b7d21f",
        "title": "my title",
        "fields": [
            {
                "key"....
   ....
}

It will be good if you take a look on how the JSON is parsed using the filter...

Start by reproducing the issue through the acf/settings/load_json filter with the exported JSON examples in the report. Trace the filter's JSON loading and parsing path; done means exported JSON wrapped in an outer array loads and parses correctly while preserving the existing sync behavior.