What I mean by that is that when there are multiple AFVs close to each other (even wrecks count), the PARS missile usually switches off the initially locked target. This behavior should be remedied for the PARS as it makes it virtually impossible to kill things such as SPAA or people that simply drive by a wreck.
Targeting individual parts of a tank, such as ammo, crew etc. is already impossible to the FnF nature of the missile, but the lack of post penetration damage requires you to shoot two or sometimes three missiles at a target to kill it.
So simple solutions would include:
Wrecks simply don’t count as valid “targets” for a missile.
Targets become “tagged” and everything else that is a valid target will be ignored.
The same applies for the locking on phase of the missile. It loves to “jitter” between targets. The same issue exist as already listed above.