This can be because the Query is breaking due to the use of two identical fields in the Logbook.
You can use up to 125 identical characters for two fields on Logbooks.
If you have many fields listed in the query, we advise to select 1 by 1 to identify which one may be causing this to be blank.
Once Identified, access this field in the Logbook template.
Retype the field.
Save.
Access the query to check if this now populates.
If the above has not solved the issue, raise a new case online and reference the title of this article confirming the following details:
Confirm query in question.
What you have actioned so far.