Screen/Window State bug on view post screen
On iPhone, when you click on a post to enlarge it, if you swipe From the right side of the screen leftwards, the chat pane will slide out. This should not occur since you are currently viewing a post and not the actual screen that holds the main interface. To be precise, you can do this on the screen showing the full post text and the options to close the post or delete it (trash icon). While this isn't a really serious bug, it's still one of those small bugs you'd probably want to get rid of to polish the app off.
Recreation: go to any page on iOS twitch app that has a long post message. Tap it to enlarge/show the full message. Slide from either side of the screen and watch as the blurred background reflects the action: opening the menu/chat pane.
Device info: iPhone 6 (regular), iOS 10.3.2; twitch app is Version 3.20.2