I am encountering a strange behavior on an Ubuntu 16.04.6 LTS machine. Namely, some application in some situations refuse to move to another workspace. At the same time, others can be moved. I do not believe this is limited to specific applications since the same ones have exhibited both types of behavior. It may have something to do with suspending the machine prior to appearance of this behavior, but I am not sure about that. Does anyone know what can cause this? I have just started exploring the workspace feature and have been enjoying it until this behavior appeared.