The popout player is bugging out. If you are watching a stream then use the popout feature and then close the popout, you can still hear the stream in the background. You can keep opening the same stream and you will have multiple audio's of that stream even though they are supposedly closed.
Can confirm I am having this issue as well, along with popout player now forces the chat on the right side when watching live streams (doesn't happen with VODs). Strangely, I only started having these issues about a month ago, yet these posts are from August, so it's kind of weird. Overall popout player is super broken and needs some fixes soon!!
I confirm the bug is real. If it is hard to implement the auto-closing when exiting the popout, maybe a manual "exit" button would be useful ?
Yes, THIS. Super annoying. It's only recently started doing this. The audio continues playing sometimes even when you close the main Twitch window/app!
The only way to fix this (besides force-closing) is to go into the titlebar menu -> "Window" submenu -> "Reset Release Overrides"
This basically clears the entire board, but will also close any streams you're watching. Super annoying, as this wasn't an issue until a month or so back.