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TPS65987D: Host connection via I2C1 (slave) not working when I2C3 is also in use and configured as master

Part Number: TPS65987D
Other Parts Discussed in Thread: BQ25703

We have design where BQ25703's I2C is connected to TPS65987D I2C3. BQ25703 is configuration is written by TPS during Power-On. However, when this 'App Config Binary Data Indices' (0x62) register is set (and I2C3/BQ configuration works ok) I2C1 stops working. When I2C scan is done, TPS I2C address is not seen.  If register 0x62 is set to zero, then I2C1 connection works fine, but then of course BQ's initialization is not done.

Why I2C1 stops working when 'App Config Binary Data Indices' (0x62) register is set?