FSM saving changes on states sometimes fails

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To reproduce open UnPeuDeReact and open the view on the testDelay state machine.
Try to edit the label of the lowest state on screen. Save.
The following error should show up.

At first sight, it seems related to connecting transitions that have no assigned label.

[default] {"refId":"State:24034102:sxFP0j","version":2,"x":215,"y":424,"id":51302,"index":2,"onEnterEvent":{"content":"RequestManager.sendCustomEvent(\"popupEvent\", {\"timeout\":0,\"content\":\"<p>Hellooooo</p>\"});\nDelayedEvent.delayedFire(0, 10, \"stopCoffeeBreak\");","language":"JavaScript","parentType":"State","parentId":51302,"@class":"Script"},"transitions":[{"refId":"Transition:#0:2ktGao","id":51303,"version":1,"index":0,"nextStateId":3,"preStateImpact":null,"triggerCondition":{"content":"Event.fired(\"stopCoffeeBreak\");","language":"JavaScript","parentType":"Transition","parentId":51303,"@class":"Script"},"dependsOnStrategy":"AUTO","dependencies":[],"label":null,"stateMachineId":51295,"parentType":"State","parentId":51302,"@class":"Transition"}],"label":"sdfdffsdf","parentType":"FSMDescriptor","parentId":51295,"@class":"State"} [ { "path": [ "transitions", 0, "label" ], "property": "instance.transitions[0].label", "message": "is not of a type(s) string", "schema": { "required": true, "type": "string", "value": "", "view": { "featureLevel": "DEFAULT", "index": 0, "label": "Label" } }, "instance": null, "name": "type", "argument": [ "string" ], "stack": "instance.transitions[0].label is not of a type(s) string" } ]

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Current workaround
Edit the transitions that are linked to the edited state and give it a label