Is there any problems which connect INTVCC together of two parallel chips ?
INTVCC should not be connected together.
When two INTVCC are paralleled, it like two voltage sources are in parallel.
Due to some negligence, INTVCC has been linked together in the first edition, What kind of impact would that have?
We recommend that you disconnect the INTVCC pins. The INTVCC pin is the output of an internal voltage regulator. If they are connected together, it may lead to unbalanced current sharing between the two regulators, and potentially overstress and damage one of them, leading to the failure of module. We suggest that you disconnect the pins to avoid the risk.