Limit where the more block can be inserted

[carolinan]

Description

The more block is the block version of the <!--more tag and if I understand correctly it only works if it is placed in the block editor, in the post or page content.
Code reference
Codex

Here are some examples of how themes in the theme directory use the more tag:
https://wpdirectory.net/search/01HWCBQ0RDFYTFCV7PHDB6X9K9
It seems to be exclusively used for custom excerpt functionality.

I feel that the open issues for the more block and the read more block shows that these blocks are easily mistaken for the other, and I wonder if this block should be limited to the block editor/pattern editor and not be placeable in templates.

It would reduce (but not completely remove) the risk that the more block is added in a query loop where it does not do anything.

Is there any other way to prevent it from being added inside a query?

Step-by-step reproduction instructions

If you wish to test if the block does anything in a template, just add it to any template and view the front.

If you wish to test how it works, then add the more block to a post, add some content before and after it, and set the query loop to display the post content. It does not work with the post excerpt.

Screenshots, screen recording, code snippet

Environment info

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes

[richtabor]

I wonder if the "Read more" block should be called the "Post link" block; that would reduce confusion as well. It will only render "Read more" if you don't change its content.

Yes, the "More" block should probably only be insertable within post content.

[carolinan]

Or we try to merge them into one but I don't know how that would work.

[richtabor]

Yea I don't think that will work. More block is fundamentally different than just linking to the post.