As this is very likely due to using the local library plug-in from 5.666 (ml_local), it doesn't live update it's views when new media is added (the replacement plug-in (ml_ll) does a better job but can still fail with the existing preview/beta versions with changes made a few weeks back to hopefully improve it if the file hasn't been seen by the local library before).
Due to the age of the build & that I'm trying to get a new one finished off, this will need to be re-checked once a new build is released. In the meanwhile, F8 when a local library view is active can be used to try & live refresh the view however I'm not actively investigating issues related to ml_local as it's got no future with WACUP once ml_ll is finished.
-dro