Going to preface this with “I do not know much about the block editor”
However, what I do know is if the field is set in a different block then you won’t be able to get a value from a different block do show it, or from a different post. When getting a field from somewhere else you generally need to provide the post ID that the value is associated with. https://www.advancedcustomfields.com/resources/how-to-get-values-from-another-post/
