CaptchetatController getCaptcha method response doesn't specify a content-type header.
Javascript and image are returned with Drupal default text/html;charset=utf-8 content-type header.
Because of this invalid content-type header, Javascript is not executed on Drupal 11.
I think this behavior should also be fixed for Drupal 9 and 10.
Try to display a CaptchEtat captcha on Drupal 11.
Check content-type header of /simple-captcha-endpoint requests in the web developer console of your browser.
Use the Drupal http client instead of curl to easily add the content-type header value provided by the call to the CapchEtat API endpoint to the getCaptcha controller method response.
With this fix, CaptchEtat works perfectly fine on Drupal 11 (Captcha module needs to be patched though).
Validate MR.
Fixed
2.0
Code