Bug? Ubuntu 19.10 / TS 3.5.2


I have an annoying issue. I am using HDMI sound output and a mic connected to the rear mic input of the motherboard. When the monitor goes to sleep, upon resume TS is working incorrectly - several blue leds of the clients in my channel are frozen on “speak” position, my own led is not activated, hence I can’t speak, the client is not closing and I have to kill it.
However when I set the monitor to never sleep, all is fine. All was fine in Windows 10 too.
Thank you in advance for your time and attention!

Best regards,

Edit: Well I found a longer cable and connected the stereo to the line out of the motherboard. The problem is gone, all is working normally. However it would be nice if the issue could be fixed.