Xfinity Stream does not pause

This occurs with recorded shows that have commercial skip indicated (where you fast forward either slow, med, fast and the program will automatically resume after the commercials). If the recorded show does not have commercial skip indicated then, of course, there is no automatic commercial skip and no ability or problem with it jumping back to the beginning of the last section of the program just watched after the last set of commercials. Likewise there is no commercial skip for On Demand content. The problem is with the commercial skip function.

I appreciate you for clarifying that @user_f66961! Does the slowly forwarding while pressing pause happen on recording and On Demand content?

Here's what happens when playing back recorded content that has commercial skip capability: In every recording at some point, but not all the time, when you press the pause select button instead of pausing the slow fast-forward begins. So when you come back it has advanced quite a ways in the recording instead of pausing. This is the biggest problem.  The secondary problem is that sometimes, but not at first, when you press the fast-forward button to automatically skip the commercial, it will jump back to the first of the part you just watched right after the last commercial. Sometimes it will not let you fast-forward to where you want to continue playing the recording after the next commercial. This seems to me to be two problems. 1). The pause sometimes actually just is slow fast-forwarding.  2). Commercial skip, when available (and you can see all the commercial areas of the recording in yellow while the show parts are in blue) later in the playback does not function correctly. When you press fast-forward it jumps back to what you just previously watched. Often if you try to fast-forward at this point you can get to the next blue part of the program you haven't seen, but sometimes it just ends the playback and you have to start the Watch all over from the beginning of the show.  These are two serious bugs. Nothing to do with On Demand. Just Xfinity Stream program playback of a show you have recorded.