When a category is configured to require approval for new topics, the topic’s category is not displayed in the review queue. I ran into this issue on Meta earlier today. The only way I could see to find the topic’s category was to approve the topic. Here’s a screenshot of a similar review item from my local dev site:
This seems to be a regression, even - I believe next to the topic tags it used to show the category (e.g. we have rules per category, and some ‘watched words’ to prevent common abuse by moving it to manual review, but depending on the category we need to approve or reject the post).