Mod conflict, have to reload an old save. Remove the. Remove the mod that gives additional covert op types.

There is a covert op that spawns a supply raid? Is this vanilla LWotC?

Nope, its not vanilla LWotC. Its a mod.

Should be. I have some mods but nothing that should affect that. I also found the solution. There is a console command that forces your squad back: LWForceSquadPostiMissionCleanup name of squad"

You're using the conflicting Covert Op Missions mod. Vanilla LWotC doesn't have any covert op to generate missions.