And your source for this? The datasheet specifies the pin as a high impedance pin, as an input it has 50K of impedance. Even 10ua with a 50K impedance would mean the voltage at the reference pin would be 0.5V less than it should be. Now we don’t know if the “high impedance source” means 50K because the datasheet does not give any specifications for this pin as an output. Hmmm … why might that be?
But there is nothing wrong with connecting a bidirectional pin to another output. It is, in fact, very common.