Pocket 4K HDMI Timecode Sync Not Working

I've been using a Tascam DR-701D with my Pocket 4k for years due to the ability to sync the timecode over HDMI and start recording automatically with the camera. I more recently purchased an Atem Pro Mini ISO to use to control two cameras and record dual cam projects. This required updating the firmware on my Pocket 4k to allow camera control, but afterwards it no longer syncs the timecode with the Tascam over HDMI.