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IWR1443: Question about framecfg

Part Number: IWR1443

Hello,

Customer reported if they configured as below with 256 loops of chirps, then the cfg will fail.
channelCfg 15 3 0
adcCfg 0 1
adcbufCfg 15 0 0 1 1
lowPower 0 0
profileCfg 0 77 7 5 54 0 0 5 1 256 5500 0 0 48
chirpCfg 0 0 0 0 0 0 0 3
frameCfg 0 0 256 0 256 50 1 0
setHSI CSI
sensorStart

I debugged in CCS and found it shows framecfg failed.

I changed the cfg as below and it works ok.
channelCfg 15 3 0
adcCfg 0 1
adcbufCfg 15 0 0 1 1
lowPower 0 0
profileCfg 0 77 7 5 54 0 0 5 1 256 5500 0 0 48
chirpCfg 0 0 0 0 0 0 0 3
chirpCfg 1 1 0 0 0 0 0 3
frameCfg 0 1 128 0 256 50 1 0
setHSI CSI
sensorStart

As per online training Chirps can be repeated max 256 times within a frame.
In customer's cfg, they use two TX and set number of loops to 256. Does this violated below statement (max 256< 2x256 (2TX))? If not, what causes the failure of framecfg?

Regards,
Chris