SOLVED: Webhooks no longer work since update to 10.9

[Hausmeister]

System: Ubuntu 22.04.4 LTS 

Hi,

I updated my Jellyfin Server to 10.9 yesterday (now 10.9.1). Since then, the webhooks no longer work for me.

Procedure: I add a new video, have it indexed and run "Webhook Item Added Notifier". Nothing happens.

I have the webhook plugin set to DEBUG Log.

Protocol:

Code:

[2024-05-13 12:23:10.272 +02:00] [INF] [107] Emby.Server.Implementations.IO.LibraryMonitor: "Staffel 1" ("<path>") will be refreshed.
[2024-05-13 12:23:10.284 +02:00] [INF] [92] MediaBrowser.MediaEncoding.Encoder.MediaEncoder: Starting "/usr/lib/jellyfin-ffmpeg/ffprobe" with args "-analyzeduration 200M -probesize 1G -i file:\"<path>\" -threads 0 -v warning -print_format json -show_streams -show_chapters -show_format"
[2024-05-13 12:23:10.824 +02:00] [INF] [107] Jellyfin.Server.Implementations.Trickplay.TrickplayManager: Creating trickplay files at 320 width, for "<path>" [ID: something]
[2024-05-13 12:23:10.825 +02:00] [INF] [107] MediaBrowser.MediaEncoding.Encoder.MediaEncoder: Trickplay generation: "/usr/lib/jellyfin-ffmpeg/ffmpeg -loglevel error -init_hw_device vaapi=va:,kernel_driver=i915,driver=iHD -init_hw_device qsv=qs@va -filter_hw_device qs -hwaccel vaapi -hwaccel_output_format vaapi -noautorotate -i file:\"<path>\" -noautoscale -an -sn -vf \"fps=0.10000000149011612,setparams=color_primaries=bt709:color_trc=bt709:colorspace=bt709,scale_vaapi=w=320:h=180:format=nv12:extra_hw_frames=24,hwmap=derive_device=qsv,format=qsv\" -threads 8 -c:v mjpeg_qsv -qscale:v 4 -f image2 \"/var/cache/jellyfin/temp/df8439757e3c467a8db93389f77e8d27/%08d.jpg\""
[2024-05-13 12:23:56.978 +02:00] [INF] [87] Emby.Server.Implementations.HttpServer.WebSocketManager: WS "127.0.0.1" request
[2024-05-13 12:24:04.252 +02:00] [INF] [108] Jellyfin.Server.Implementations.Trickplay.TrickplayManager: Finished creation of trickplay files for "<path>"
[2024-05-13 12:25:27.066 +02:00] [DBG] [58] Jellyfin.Plugin.Webhook.Notifiers.ItemAddedNotifier.ItemAddedManager: ProcessItemsAsync
[2024-05-13 12:25:27.067 +02:00] [INF] [58] Emby.Server.Implementations.ScheduledTasks.TaskManager: "Webhook Item Added Notifier" Completed after 0 minute(s) and 0 seconds

What I have tried so far:
- Webhook settings reset (target is Telegram)
- Webhook plugin uninstalled (after uninstalling v12, v11 appeared, which I also uninstalled) then reinstalled version 12
- SMTP notification added to make sure it's not Telegram

Do you have any ideas where I could look to see what the problem is? Or did I miss something I should have done during the upgrade?

Thanks in advance
Hausi

[EDIT] I tried a bit more. If I add "Playback Start" to the "Notification Type", the SMTP message works. So it's not the plugin or its setting. It doesn't seem to see that something new has been added.