MIPI C-PHY data rate confirm

We use Jetson Orin on our custom board, according to Orin data sheet,
MIPI C-PHY supports up to 4.5 Gsym/s (G symbol/sec) per trio.
But, when we config rate up to 4.2Gsym/s,Camera data capture abnormal。
4.1Gsym/s is normal。
So we want to confirm,the root cause of this limit?

Please check your custom pcb design based on to the MIPI CSI C-PHY Interface Signal Routing Requirements in Design Guide for detail.