Back when the air carriers first got TCAS, I recall a infamous S.E. US
part 121 carrier going around over the threshold at Hobby 13R because
he got a TCAS WARNING. He explained that it was his company policy to
go-around anytime TCAS alerted. Of course it was clear and a million,
no vehicles or aircraft on the runway. Hobby Tower nor the other pilot
on frequency were NOT impressed with that decision. The TCAS Warning
orginated from a transponder being benched tested in a hangar.

One visual peeky-boo and common sense is worth $$$$.