I'm also having this issue. Seems like the medkit respawn system also stops working. Pretty much get Noble 6'd.

For me the problem was with "\hostiles\lists.sqf"

After wave 12 Viper teams are supposed to spawn but the file path to the composition was invalid, so it would cause the _groupConfig array to go out of bounds.

To fix it, I replaced line 116:

_groupConfig = configfile >> "CfgGroups" >> "East" >> "OPF_F" >> "SpecOps" >> "OI_ViperTeam";

with this line :

_groupConfig = configfile >> "CfgGroups" >> "East" >> "OPF_V_F" >> "SpecOps" >> "O_V_ViperTeam";