GstRpiCamSrc error for bitrate greater than 20000000

GstRpiCamSrc documentation says maximum bitrate is 24000000 (24E6) but gives an error for bitrates greater than 20000000 (20E6) for camera version 2 (perhaps not for version 1).

Can somebody reproduce this for version 1 camera and/or version 2 camera? Perhaps there is only for version 2 another maximum that applies.