A bug that's become a really big problem for me is with the chat. In normal client, I play with the HUD flipped, so minimap is in the bottom left corner, and with chat dragged to just > of map, above the skills. With spectator mode, minimap is in bottom right and unable to move, and my chat defaults to offscreen <. The little bar to drag it gets hidden behind blue side champs, so I have to hide them, to drag chat over to use it (or view it). Doing this, then changes where my chat shows up when i go back to playing as well.
tldr; chat placement should be separated for spectate and playing, or allow minimap flip in spectate.