Submitting a comment redirects to a blank "Comment sent" state and the original post disappears

### Description
When submitting a comment on a post, the page navigates away from the article and shows only a "Comment sent" confirmation message, with the original post content no longer visible.\

### Steps to reproduce
Open any blog post with comments enabled.
Scroll to the comment form and submit a comment.
Observe that the page reloads/redirects to a state showing "Comment sent" instead of staying on the post with the new comment appearing inline.

### Expected behavior
After submitting a comment, the user should remain on the post page (or be redirected back to it) with the new comment visible in the discussion thread, similar to standard WordPress comment behavior.

### Actual behavior
The post content disappears and only a generic "Comment sent" message is shown, breaking the reading/discussion flow.

Start at the comment form and the submission or redirect handling for a post with comments enabled. Reproduce the issue, then trace how the post page is selected after submission; done means the reader returns to the post with the new comment visible inline instead of only seeing “Comment sent”.

Written by the indexing model from the issue text.