Post Editor does not reflect changes in core/post-content layout

[richtabor]

As I investigated #60308, I ran into this layout quirk, where the post editor would not respect the template's layout of default, to span inner blocks fullwidth.

Using a core/post-content block with a default layout, blocks in the Site Editor were properly fullwidth, as was the front end of the page. The Post Editor however did not reflect those changes.

I expected each of these to be the same result, appropriately reflecting default and constrained.

2.mp4

[tellthemachines]

It did work like that before, but a change was requested in #52163.

[richtabor]

If we have #54371, it should be the case on the front-end as well (which we know if not a good idea). I'll leave a comment.