I'm having the same issue. I can replay full games but not condensed for week 1 - can replay preseason games in condensed format. The problem is unique to Roku as I can replay in condensed format on all of my iOS, Windows and Android devices.
NFL support has gone from an email submission to an online Chat submission but it crashes no matter what operating system or device I use. I get the message "Oops! Something went wrong." every time. So there is no way to report this to NFL who continually amaze me how incompetent they are with streaming. There hasn't been a single year that I haven't had a technical problem with replaying games.