xfinity stream fast forward button not accessible for in-progress recordings on LG tv.

The fast forward button appears but cannot be selected for in-progress recordings when running xfinity stream on ethernet connected LG tv, even if program has run for 30+minutes (no "catch-up"). This change happened sometime in the last month for recordings on multiple channels.  I have hard reset tv, uninstalled and reinstalled app with no success. If viewing xfinity stream on wifi at home, I cannot access in-progress recordings online through google chrome because "I'm not on my home network" (although I am) - so I cannot test the fast forward on a different device.