Thunderbird's brain gets stuck after going off screen when it's heading home

In stategraphs/SGthunderbird.lua:

    State{
        name= "idle",
        tags = {"idle", "canrotate"},
        
        onenter = function(inst)
            if inst.fx and math.random() < 0.1 then
                inst.fx.AnimState:PlayAnimation("idle")
            end

            inst.components.locomotor:Stop()
            inst.AnimState:PlayAnimation("idle")
        end,

        events=
        {
            EventHandler("animover", function(inst) inst.sg:GoToState("idle") end ),
        },
    },

When the entity goes asleep and come back again, it somehow first go to its default state, then enter whatever state it was before going asleep. Therefore whenever a thunderbird goes off screen and come back, onenter calls LocoMotor:Stop, which sets LocoMotor.dest to nil, causing it to stop moving. It's easy to see LocoMotor.dest changing to nil if you select the entity and look at LocoMotor's debug string.

This can be easily fixed by changing LocoMotor:Stop to LocoMotor:StopMoving.