Plex Media Scanner suddenly stopped working (not identifying items anymore)

Server Version#: 4.108.0
Player Version#: N/A

I have noticed that Plex Scanner must have stopped working on my Synology a while ago, presumably following a Plex server software update, as it is no longer identifying any new items I add to my library (movies, TV shows and albums). It verified this both in the Mac Player app and in the web interface.

All new items I add stay without metadata and feature no cover image. Selecting “Match…” on the individual item jumps immediately to “No matches found” seemingly without any actual attempt at searching for metadata. It does so even with very well-known media.

Two exemplary items: the album “Silent Alarm” by Bloc Party and the movie “Holiday” (1930).

I noticed some curious instances in the logs:

Sep 20, 2023 23:37:42.633 [139912832400184] DEBUG - Looking for path match for [/volume1/video/Filme/Ungesicherte Filme/Holiday.1930.1080p.BluRay.x264YTS.LT.mp4]
Sep 20, 2023 23:37:42.634 [139912832400184] WARN - Scanner [Plex Movie]: unable to find cloud match for item file '/volume1/video/Filme/Ungesicherte Filme/Holiday.1930.1080p.BluRay.x264YTS.LT.mp4'
Sep 20, 2023 23:37:42.634 [139912832400184] DEBUG - Native Scanner: Executed Cloud Match stage **in 0.00 sec.**
Sep 20, 2023 23:37:42.640 [139912935586616] DEBUG - Native Scanner: Executed Local Metadata stage **in 0.00 sec.**
Sep 20, 2023 23:37:42.641 [139912937696056] DEBUG - Path matched, we're reusing media item 67024
Sep 20, 2023 23:37:42.642 [139912937696056] DEBUG - Native Scanner: Executed Add to Database stage in 0.01 sec.
Sep 20, 2023 23:37:42.642 [139912832400184] DEBUG - Native Scanner: Executed Media Analysis stage in 0.00 sec.

and:

Sep 22, 2023 09:17:20.837 [139912894311224] DEBUG - Matching 'Holiday' (ID 197678) with agent tv.plex.agents.movie
Sep 22, 2023 09:17:20.839 [139912853494584] DEBUG - HubCache: Expiring '1/movie.recentlyadded.1/1/hubs/promoted/de-DEexternal-media,hub-style-list/contentDirectoryID=1&count=25&excludeContinueWatching=1&includeExternalMedia=1&includeMeta=1&includeRecentChannels=1&pinnedContentDirectoryID=1%2C2%2C17%2C34%2Cplaylists%2C35%2C3%2C4%2C14' because event plex.event.item.updated referenced an item the hub contained
Sep 22, 2023 09:17:20.839 [139912894311224] DEBUG - Refreshing metadata for 'Holiday' (agent: tv.plex.agents.movie)
Sep 22, 2023 09:17:20.839 [139912853494584] DEBUG - HubCache: Expiring '1/movie.recentlyadded.1/1/hubs/promoted/de-DEexternal-media,hub-style-list/contentDirectoryID=1&count=25&excludeContinueWatching=1&includeExternalMedia=1&includeMeta=1&includeRecentChannels=1&pinnedContentDirectoryID=1%2C2%2C17%2C35%2Cplaylists' because event plex.event.item.updated referenced an item the hub contained
Sep 22, 2023 09:17:20.839 [139912894311224] DEBUG - MetadataAgentPostProcessor: adding id 197678 to refresh queue (0 items in queue)
Sep 22, 2023 09:17:20.839 [139912853494584] DEBUG - HubCache: Expiring '1/movie.recentlyadded.1/1/hubs/promoted/deexternal-media,indirect-media,hub-style-list/contentDirectoryID=1&count=12&excludeContinueWatching=1&excludeFields=summary&includeLibraryPlaylists=1&includeMeta=1&includeRecentChannels=1&includeStations=1&pinnedContentDirectoryID=1%2C2%2C17%2C14%2C4%2C13%2C11%2C10%2C3%2C5%2Cplaylists%2C35' because event plex.event.item.updated referenced an item the hub contained
Sep 22, 2023 09:17:20.840 [139913022618424] DEBUG - Activity: registered new activity 1fa6e288-be73-48a3-a0bf-a10683b1c554 - "Processing subscriptions"
Sep 22, 2023 09:17:20.841 [139913022618424] DEBUG - Activity: Ended activity ef493b57-d108-489c-96b8-39bd471a9f2e.
Sep 22, 2023 09:17:20.844 [139912900639544] DEBUG - Grabber: Cleaning up orphaned grabs.
Sep 22, 2023 09:17:20.848 [139912851385144] ERROR - MetadataAgentPostProcessor: **failed to find agent for identifier tv.plex.agents.movie**

Logs are included.
Plex Media Server Logs_2023-09-22_13-28-24.zip (5.0 MB)

Are you perhaps using Hetzner as the Media Server?

As I said, I am running my own instance of Plex on a local Synology. Internet access is a fibre connection provided locally.

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