The ECM Pods for the MH-80 DAP Ghost Hawk react only to certain IR missiles like Titan AA, but ignores other missiles.

I believe the cause is that BIS_fnc_Pylon_ECMPodIncoming only checks for irLock to determine if a missile is IR-based, but does not check for the presence of IRSensorComponent:

/*
    BIS_fnc_pylon_ECMPodIncoming
    Called by the vehicle's IncomingMissile EH when a missile is detected.
...
*/
private _isIR = (getNumber (configFile >> "CfgAmmo" >> _ammo >> "irLock")) > 0;

A mission file is attached to test various IR missiles, including Titan AA, RIM-116, Titan AT, and BIM 9X. Below is a video recording demonstrating the mission: