Unable to search within topic communities

Summary:

We've just discovered that nothing happens when a learner tries to use the search field within a topic community. Regardless of what is used to create a search, the list of courses doesn't change from the one presented when the community is opened.

Is anyone else having this issue?

Content (required):

Version (include the version you are using, if applicable):

21D

Code Snippet (add any code snippets that support your topic, if applicable):