Tell us what you are trying to do?
Ensure all posts using the custom layout can display the default WP limit of 55 words of the excerpt.
The problem I am seeing is that the settings for the word length of the excerpt are basing the upper limit on the "active" post. The current post has only 34 words in the post. It guessed that I only wanted to display 30. (I do not want to display an ellipsis and "read more" for an extra four words). It allows me to increase the amount to 34 but not to 55.
Is there any documentation that you are following?
No
Is there a similar example that we can see? hidden link
What is the link to your site? hidden link
We are aware of the UI problems with the post excerpt length selector and have an internal ticket to fix it.
In the meantime, the simplest solution is to use the legacy wpv-post-excerpt shortcode to generate the excerpt, which you can add to a Custom HTML block (or any other block that expands shortcodes).
