When I try to edit and update post, it return 403 error.

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As the title says, when i try to edit or update post, Updating failed. The response is not a valid JSON response. is returned. But in the console, it says 403 error. Tried everything that I found on the internet but nothing is working.

I have already

1. created new htaccess file
2. gone through all the permissions, it seems okay,

Update
Using the classic Editor works perfectly though.

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