Hello,

Yes if you do not set the post-featured image the date is not visible. It is the same behavior on our test site. It is the default functionality of our theme.
https://ibb.co/Qjp7Gbj

Also, I have added the following CSS code in Theme Setting -> Global Custom Css.

.wd-entry-meta .meta-author {
    display: none;
}

Best Regards.