Diskcache service does not always make scanned updates available to network clients.
When querying the diskcache server, you can watch the logs, see a directory get scanned and frames added to the cache. Then when you request via the network the intervals you do not see the updates reflected in the results of the api call.
Seen on nds-1.ldas.cit, Rocky 8 Diskcache 2.7.7 installed from RPM. The client was a custom python client connecting over TCP.