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TTworkbench: why is the payload of ETS message from the test system is longer than the length value in the message?

The message is constructed based on Ethernet.
If the message to send it shorter than 60 bytes, it will be padded to 60 bytes before sending. The mininal length of Ethernet frame must be 64 bytes, which consists of

Dest-MAC-Address = 6,
Src-MAC-Address = 6,
Frametype = 2,
Data >= 46
FCS = 4
Total = 64

Please refer to the following articles

The DUT should be able to recognize the real length of payload according to the length value in the message.

Product : TTworkbench