Does anyone have the idea of D750 HDMI output behaviour same like D600/D610/D800 when recording 1080

Sorimachi

Does anyone have the idea if Field Monitor had been plug into D750, HDMI output behaviour same like D600/D610/D800 strange behaviour when recording in 1080P ? What do i mean is when I record to card, HDMI outputs limits at 720p. Video on the monitor looks great when in live view mode, but when press record the video cuts out as the camera is now sending a smaller video format and the monitor takes a few seconds to adjust to the new stream. All other cameras can't send constant 720p to monitor while recording internally in 1080p. So the only solution is to record 720/25p (both internally and HDMI signal) so it doesn't produce that blue screen. Does the D750 are same with them? Or D810 it's same too?