I've encountered a bug, when decorating the room the game quest glitches out and won't recognize that you have placed the bed and exited the placement mode
If possible, could you describe in more detail what you did step-by-step leading up to the bug? The way that I've programmed the completion criteria for that quest is not very smart, so it's possible that if a step was somehow skipped from the tutorial, then it won't be registered as complete.
Any additional info you can provide to help be reproduce the bug will be helpful. Thanks for checking the game out and reporting it to me!