On the first Google TV Streamer, Bluetooth headphones were roughly 200–250 ms late in Netflix while YouTube remained in sync. The usual sound settings did not fix it. The same failure and workaround were later reproduced on a second Streamer with different headphones and a different Bluetooth codec.
The evidence pointed to Netflix using Android's tunneled playback path over Bluetooth. On both devices, that path used hardware A/V sync, and the observed behavior was consistent with the headphones' presentation delay not being compensated correctly. Adding Netflix's own platform capability below forced non-tunneled playback over Bluetooth:
"tunnelModeWithBTSetting": "disable"