Gutenberg Json and https errors

Hi,
If i go to edit post, i can’t see in the side panel: categories selection and tags selection
Plus i have an error in chrome dev:

Mixed Content: The page at 'https://www.xxxxxxx.com/wp-admin/post.php?post=28017&action=edit' was loaded over HTTPS, but requested an insecure resource 'https://www.xxxxxxx.com/wp-json/wp/v2/users/me/?_locale=user'. This request has been blocked; the content must be served over HTTPS.
post.php?post=28017&action=edit:1 Mixed Content: The page at 'https://www.xxxxxxx.com/wp-admin/post.php?post=28017&action=edit' was loaded over HTTPS, but requested an insecure resource 'https://www.xxxxxxx.com/wp-json/wp/v2/taxonomies/?per_page=100&context=edit&_locale=user'. This request has been blocked; the content must be served over HTTPS.
data.min.js?ver=4.9.2:1 Uncaught (in promise) {code: "invalid_json", message: "The response is not a valid JSON response."}

data.min.js?ver=4.9.2:1 Uncaught (in promise) TypeError: Failed to fetch

If i use the plugin “Classic editor” errors gone and everything is working normal.

What i tried so far and testing after every step:
Create a staging website, disable all plugins, change to default theme (twenty twenty),
remove everyhting in htaccess and keep only wp codes, add https redirect (with wp codes in htaccess)

I checked that i have “https” in “wp-config.php” for site url and home
I checked wp options database that https are present for site url and home

I’m using this code to redirect to https:

RewriteEngine on
# force SSL
RewriteCond     %{SERVER_PORT} ^80$
RewriteRule     ^(.*)$ https://%{SERVER_NAME}%{REQUEST_URI} [L,R=301]

I don’t know where to look else?
need you help

Thanks