The 2.1.2 update should have fixed all issues reported in this thread. Before, group_manger.sqf was terminated externally when the group was despawned, and if the termination happened slightly after the despawn, this would cause variables in the .sqf to be undefined for an instant.
Now, a setVariable command is used to let group_manager.sqf know that the group needs to be despawned, so it does all the work despawning/deleting the group and terminating itself afterwards, thus completely eliminating any chance of undefined variable errors.
All in all, this was possibly one of the most harmless problems in DZAI's history, just annoying to see in the .RPT log. Errors that appear in the RPT log aren't always cause for concern unless they have real in-game consequences, which is why this issue was considered very low priority.
Now, a setVariable command is used to let group_manager.sqf know that the group needs to be despawned, so it does all the work despawning/deleting the group and terminating itself afterwards, thus completely eliminating any chance of undefined variable errors.
All in all, this was possibly one of the most harmless problems in DZAI's history, just annoying to see in the .RPT log. Errors that appear in the RPT log aren't always cause for concern unless they have real in-game consequences, which is why this issue was considered very low priority.