I have the same log
20200713 010030 worker: Job update_library
20200713 010031 thmcache: Start
20200713 010031 thmcache: Scanning: NAS, SDCARD, UPNP
some messages about incorrect ID3v2 tags
20200713 175750 thmcache: Done: 28917 album dirs processed
20200713 232509 worker: Job update_library done
But I can't start update again
20200713 010030 worker: Job update_library
20200713 010031 thmcache: Start
20200713 010031 thmcache: Scanning: NAS, SDCARD, UPNP
some messages about incorrect ID3v2 tags
20200713 175750 thmcache: Done: 28917 album dirs processed
20200713 232509 worker: Job update_library done
But I can't start update again