When going through the pattern creation flow in wp-admin/edit.php?post_type=wp_block (not what's available in the site editor), there is no ability to set a title for the pattern. This is using WordPress 6.5 beta 3. If you use 6.4.3, a title field is available. Below is a video that walks (and talks) you through it:

This is a regression and something that needs to be fixed for 6.5 so automatically adding to the to do column. Without a name, it becomes much harder to find the pattern you created!