Can't add or edit field - Uncaught TypeError

I can drag&drop new fields and edit fields.
In browser JS console, I’ve got this issue :

Uncaught TypeError: gform.initializeOnLoaded is not a function
.... /gravityforms/js/gravityforms.min.js?ver=2.5.12:1

Uncaught TypeError: gform.addAction is not a function
    .... /gravityforms/js/layout_editor.min.js?ver=2.5.12:1
gform.addFilter is not a function
    ...  /gravityforms/js/form_editor.min.js?ver=2.5.12:1

There are some backend screenshots.
I disable all my plugins.
I change the custom theme to Twenty Twenty-One theme and Gravity works.
Any idea for the javascript issue ?

It looks like another plugin is conflicting with Gravity Forms. I’ll suggest you run a conflict test to help narrow it down to the offending plugin.

Thanks Samuel.
I done the conflict test. It’s not a plugin but my custom theme.
Really strange as I use the same base child theme of my theme framework.

Try enabling No Conflict mode in the Gravity Forms settings if it isn’t already enabled, your theme might be including a conflicting script in the editor, No Conflict mode should prevent that and only include the scripts Gravity Forms whitelists.

Gravity Forms No Conflict mode was enable.
I must investigate for now.

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