Real-time Editing not work

Problem/Motivation

I am working on Drupal 10.3.7 and using the admin theme Gin 8.x-3.0-rc14. I have installed the frontend_editing 1.8.4 module. In the settings, I enabled this module for a specific Content Type and a Paragraph Type used by that Content Type. After checking the "Instant Preview" option, which uses AJAX, I went back to edit my content via the module. The instant preview is not working (I tested with the variables {{ content }} and {{ content.frontend_editing }}). There are no error messages in the console or in the Drupal logs.

Steps to reproduce

1) install Drupal 10.3.x
2) install and use admin theme Gin 8.x-3.0-rc14
3) install frontend_editing 1.8.4
4) check the "Instant Preview" option in config