Post author: show author avatar placeholder

[karmatosed]

If you have 'show avatar' selected but there is the placeholder showing, I think showing a placeholder avatar probably makes sense otherwise it looks a little unexpected:

[bgturner]

Chiming in that this is still an issue while doing QA for 6.1-beta2 with the twentytwentythree theme, and without Gutenberg installed.

That means that the current functionality will soon to be shipped with WP Core.

[t-hamano]

Now the Post Author block has been deprecated, so I think this issue can be closed. See #55352 for more details.