See the attached video as a demonstration. As the digit on the far right transitions from 0 to 2, segments disable first and then the center segment enables afterwards.
This stuttered transition is aesthetically jarring. All segments change at the same time is preferable.
The LCD driver is configured to drive a static display, and the display has one backplane.
Device_ctrl = 0b00000100
Display_ctrl_1 = 0b00001101
Display_ctrl_2 = 0b00000000
Enabling a higher refresh rate or boost mode seems to have no effect.
The datasheet does not mention the timing of the segments transitioning when the segment registers are written, so it is unclear if this is expected behavior or not.