HDHomeRun tuner not released after stopping Live TV (Kodi + IPTV Simple Client + Emby for Kodi Next Gen)

[hetkoznap 2]

First of all I’m not sure exactly what’s causing the problem (Emby Server, IPTV Simple Client, Emby for Kodi Next Gen, Kodi, HDHomerRun), but I have to start troubleshooting somewhere, so I apologize in advance if this issue isn’t related to the Emby Server.

Environment:
- Emby Server 4.9.5.0 on DietPi 10.4.2 (Debian 6.12.90-2 amd64)
- HDHomeRun HDHR5-4DT (fw: 20260326) 
- Kodi 21.3 on NVIDIA SHIELD Pro
- Emby for Kodi Next Gen Kodi addon 12.4.21
- IPTV Simple Client Kodi addon 21.11.0

When I start a Live TV channel through Kodi using the IPTV Simple Client addon, stopping playback does not release the HDHomeRun tuner. The tuner keeps streaming indefinitely until I restart the Emby server. If you switch channels the second tuner will also be occupied. The HDHomeRun HDHR5-4DT has four tuners, so after the fourth channel the fifth won't start.
Importantly, this issue only occurs when using the IPTV Simple Client addon in Kodi. When I start/stop playback using the HDHomeRun Kodi addon, the native Emby for Android app, the Emby web interface or the Emby for iOS app the tuner is released correctly every time.

- The issue is not caused by another client actively watching the same channel
- The issue is not present when using other methods to watch TV
- Restarting the Emby server immediately releases the tuner, confirming Emby holds the connection (but it isn't shown on the web dashboard after stopping the channel)

I upgraded from Emby Server 4.9.3.0 to 4.9.5.0 shortly after its release and I believe the issue started around that time — though I cannot confirm this with 100% certainty.

I am not sure which component is responsible. It could be:
- A bug in Emby Server 4.9.5.0
- A bug in the Emby for Kodi Next Gen addon (delayed or missing session close)
- A bug in the IPTV Simple Client addon (not properly signalling stream stop to Emby)
- A combination of the above
- Or anything else

Thank you for looking into this!

embyserver.txt