I have the same issue currently. Came to Sonarr to see why there's no new stuff in Kodi and all downloads were downloaded, but imported to Sonarr/Kodi.
Here is a error message from Sonarr:
System.DllNotFoundException: libmediainfo.so.0 at (wrapper managed-to-native) NzbDrone.Core.MediaFiles.MediaInfo.MediaInfo.MediaInfo_New() at NzbDrone.Core.MediaFiles.MediaInfo.MediaInfo..ctor () [0x00006] in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Core\MediaFiles\MediaInfo\MediaInfoLib.cs:69 at NzbDrone.Core.MediaFiles.MediaInfo.VideoFileInfoReader.GetMediaInfo (System.String filename) [0x00021] in C:\BuildAgent\work\5d7581516c0ee5b3\src\NzbDrone.Core\MediaFiles\MediaInfo\VideoFileInfoReader.cs:43
Using the latest Milhouse build. I guess it's Libreelec 9.8 (?).
Rolled back to 9.1 and now seems to work again
EDIT: not working. Smae error