Looks like the TCAS system has been doing a fine job, which it was designed to do.
For those who don’t know, there is a system onboard every modern airliner that has one job: detect planes at (roughly) same altitude, heading towards each other. It then very clearly tells one plane to pull up while telling the other to dive.
Pilots are instructed to follow TCAS above anything else they might hear from controller or captain.
TCAS is why we have nearly no mid air collisions, especially considering the amount of planes sharing the same crowded space near airports.