Yes, I reproduced the issue many times over as I described earlier. I didn't actually take the time to watch any episodes in entirety, but I could reproduce it just by attempting to skip episodes. Then I also saved in-app logs from Emby and sent them to matchboxbananasynergy in case it was relevant.
@JoTech I messaged you on Discord. You need to be on the Alpha channel currently to get the update. Go to Settings > System > System updates > Release channel and change to Alpha. Might need to manually check for updates. After it's installed, follow the instructions provided by matchboxbananasynergy.