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DS90UB927Q-Q1: 927 has I2C output even nothing input

Part Number: DS90UB927Q-Q1

Hi Team,

My customer met a very strange problem when using 927 and 948 EVM to test.

When they only use 927 and 948 connected together, open 927 and 948 pass through, and then do nothing, 927 has I2C signal output.

Where is the 927's I2C output come from? They don't connect with SOC or Display or other things, only 927 and 948...

Actually my customer met the same problem in  their system and haven't solved. So I send them the EVM to test and the problem occurred again even in EVM...