Also, have you run an I2C scanner to confirm the I2C addresses? The hd44780 library, usually, will automatically find the I2C address and suss out the I2C expander to LCD pin wiring.
Also, have you run an I2C scanner to confirm the I2C addresses? The hd44780 library, usually, will automatically find the I2C address and suss out the I2C expander to LCD pin wiring.