How to stop RTS units getting stuck on small gaps?

Development World Creation
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I’m making a semi rts game and the units will sometimes get stuck on each other when trying to get through gaps like this (they’re really working together for this blockage)

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the units are just USphereComponents where I’ve stopped rotation and given them all no friction like this. I would have thought removing friction would have solved this kind of issue though.

            SphereComponent->GetBodyInstance()->bLockZTranslation = true;
            SphereComponent->GetBodyInstance()->bLockXRotation = true;
            SphereComponent->GetBodyInstance()->bLockYRotation = true;
            SphereComponent->GetBodyInstance()->bLockZRotation = true;
            SphereComponent->SetLinearDamping(0.5f);
            UPhysicalMaterial* PhysMat = NewObject<UPhysicalMaterial>(this);
            PhysMat->Friction = 0;
            SphereComponent->SetPhysMaterialOverride(PhysMat);
            SphereComponent->SetCollisionEnabled(ECollisionEnabled::PhysicsOnly);
            SphereComponent->SetCollisionResponseToAllChannels(ECR_Block);
            SphereComponent->SetSimulatePhysics(true);

I cant work out how other RTS games manage to prevent units getting blocked like this. does anyone have any ideas?