Eagle IV FCS bug

[madpat3]

arma version: latest
cba version: latest
ace version: latest
ace_bw_compat version: latest
bw version: latest

the fcs doesn't work (sometimes it does, then again it doesn't).
but i've noticed that, when mounting the gunner seat of the puma, and use its fcs, then return to the gunner seat of the eagle, fcs works again.

we encountered the problem on our dedicated. so i tried the reproduce it on mp-selfhosted.

steps to repuduce:
place eagle, puma and a man on map. start mission as selfhosted. get in gunner seat of eagle use fcs and fire. repeat with differen distances. sometimes it works, sometimes bullets are way off. then get in puma as gunner use fcs, then get back to the eagle and fcs works permanently.