To reproduce the bug do the following:
1. Create a new post with a this text in the body: "&".
2. It correctly shows as "&" when viewing the post. If
you view the source for index.php you see that the
entity is still there: "&"
3. Now edit the post. Dont write anything, just open
the edit page and save.
4. View the post again and look at the source. The
entity has disappeared.
The solution: In post_edit.php add the following at
line 187: $post['post_mail_body'] =
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