Success messages – is not work a properly

Hi, my contact form stop showing success message. Not success messages is showing up …
Problem is with redirection I think (500 error). It could be after happen after CF7 last updates.
After pushing button the wheel is still running around.

Could you support me with this ?
WordPress 6.5.3
CF7 5.9.4

https://e-faktury.zuk.zbaszyn.pl/wp-json/contact-form-7/v1/contact-forms/30/feedback

{"code":"rest_no_route","message":"Nie znaleziono routingu pasuj\u0105cego do adresu URL oraz metody zapytania.","data":{"status":404}}



Request URL:

https://www.e-faktury.zuk.zbaszyn.pl/wp-json/contact-form-7/v1/contact-forms/30/feedback

Request Method:

POST

Status Code:

500 Internal Server Error

Remote Address:

49.12.122.77:443

Referrer Policy:

strict-origin-when-cross-origin

The page I need help with: [log in to see the link]