We see it in smart mode but not in fast mode. What are we missing and where does this get defined?
if you can see it in both search and verbose mode, then one check that I suggest in do you know for sure that the custom meta field (i am assuming this is indexed filed and not a default field) occurs for greater than 20% of the events? To test you can change your inputs.conf and slightly re-configure the meta field to have it display for all fields like for source or sourcetype.