It's been there since as long as I can remember.
I hear players of our and other servers complaining about it on daily basis.
No matter which mission or sever.
No matter who's the owner of the vehicle.
No matter if spawned localy or on server itself.
No matter if players in group, ungrouped, if group leader gets first inside or non-leader gets first inside or 3rd player as group leader stays outside the vehicle and no matter if AI involved or not.
It concerns the following ground vehicles, that have incoming missile sound warning + M letter on radar (where radar available):
B_APC_Tracked_01_AA_F / B_T_APC_Tracked_01_AA_F (IFV-6a Cheetah)
B_APC_Wheeled_01_cannon_F / B_T_APC_Wheeled_01_cannon_F (AMV-7 Marshall)
B_APC_Tracked_01_CRV_F / B_T_APC_Tracked_01_CRV_F (CRV-6e Bobcat)
B_APC_Tracked_01_rcws_F / B_T_APC_Tracked_01_rcws_F (IFV-6c Panther)
B_AFV_Wheeled_01_cannon_F / B_T_AFV_Wheeled_01_cannon_F (Rhino MGS)
B_AFV_Wheeled_01_up_cannon_F / B_T_AFV_Wheeled_01_up_cannon_F (Rhino MGS UP)
B_MBT_01_arty_F / B_T_MBT_01_arty_F (M4 Scorcher)
B_MBT_01_mlrs_F / B_T_MBT_01_mlrs_F (M5 Sandstorm MLRS)
B_MBT_01_cannon_F / B_T_MBT_01_cannon_F (M2A1 Slammer)
B_MBT_01_TUSK_F / B_T_MBT_01_TUSK_F (M2A4 Slammer UP)
O_APC_Tracked_02_AA_F / O_T_APC_Tracked_02_AA_ghex_F (ZSU-39 Tigris)
O_APC_Tracked_02_cannon_F / O_T_APC_Tracked_02_cannon_ghex_F (BTR-K Kamysh)
O_APC_Wheeled_02_rcws_v2_F / O_T_APC_Wheeled_02_rcws_v2_ghex_F (MSE-3 Marid)
O_MBT_02_arty_F / O_T_MBT_02_arty_ghex_F (2S9 Sochor)
O_MBT_02_cannon_F / O_T_MBT_02_cannon_ghex_F (T-100 Varsuk)
O_MBT_04_cannon_F / O_T_MBT_04_cannon_F (T-140 Angara)
O_MBT_04_command_F / O_T_MBT_04_command_F (T-140K Angara)
I_LT_01_AA_F (AWC 302 Nyx (AA))
I_APC_Wheeled_03_cannon_F (AFV-4 Gorgon)
I_APC_tracked_03_cannon_F (FV-720 Mora)
I_E_APC_tracked_03_cannon_F (FV-720 Odyniec)
I_LT_01_AT_F (AWC 301 Nyx (AT))
I_LT_01_scout_F (AWC 303 Nyx (Recon))
I_LT_01_cannon_F (AWC 304 Nyx (Autocannon))
I_MBT_03_cannon_F (MBT-52 Kuma)