Publish or Updating failed. Invalid JSON response

Please check the error logs on your server for a more specific error message, which may give a clue to why this is happening on your website/server. If you need help locating them, ask your hosting provider to help you with that.

If you cannot find error logs or if you don’t find any helpful info in the error logs, enable debugging. See: https://www.ads-software.com/support/article/debugging-in-wordpress/

Remember to put things back to normal afterwards.

By the console I have:
Failed to load resource: the server responded with a status of 400 (Bad Request)

/marq/wp-json/wp/v2/pages/425/autosaves?_locale=user:1 Failed to load resource: the server responded with a status of 400 (Bad Request)

DevTools failed to load source map: Could not load content for https://sites.arq.ufmg.br/marq/wp-content/plugins/themeisle-companion/vendor/codeinwp/gutenberg-blocks/assets/leaflet/leaflet-gesture-handling.min.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE

But I don’t know what it means

400 Bad Request: That is definitely an issue you would need to ask your host about.

One more informa6tion
With classic editor, it is ok.
The problem is with any block editor

Thanks for your attention
I send the problem to the admin host