Repeatable component won't expand

[lxndr]

Describe the bug
In content editor, repeatable component created by default cannot expand. Attempt to save such an entity causes error:

Something went wrong.
Details
TypeError: Cannot read property 'isOpen' of undefined

    in x
    in x
    in Unknown
    in div
    in styled.div
    in _
    in _
    in Unknown
    in div
    in div
    in styled.div
    in div
    in div
    in div
    in styled.div
    in form

I noticed that x is actually RepeatableComponent.

Entity:

{
  "kind": "collectionType",
  "collectionName": "tests",
  "info": {
    "name": "Test"
  },
  "options": {
    "increments": true,
    "timestamps": true
  },
  "attributes": {
    "title": {
      "type": "string",
      "required": false,
      "maxLength": 50
    },
    "show": {
      "type": "boolean",
      "default": true
    },
    "items": {
      "type": "component",
      "repeatable": true,
      "component": "story-items.story-item",
      "required": true,
      "min": 1
    }
  }
}

Component:

{
  "collectionName": "components_story_item_story_items",
  "info": {
    "name": "story-item",
    "icon": "file-alt"
  },
  "options": {},
  "attributes": {
    "title": {
      "type": "string",
      "required": true,
      "maxLength": 40
    },
    "description": {
      "type": "text",
      "required": false,
      "maxLength": 220
    },
    "picture": {
      "model": "file",
      "via": "related",
      "plugin": "upload",
      "required": false
    },
    "video": {
      "model": "file",
      "via": "related",
      "plugin": "upload",
      "required": false
    },
    "pictureSource": {
      "type": "string",
      "required": false,
      "default": ""
    }
  }
}

The only workaround I found was removing the default component entry and creating a new one.

Steps to reproduce the behavior

1. Create component
2. Create content type with the repeatable component andrequired:true, min:1
3. Create entity of the type
4. Click on default component, see it's not reacting
5. Click Save
6. See error

Expected behavior
Default component can be expanded. No error on save.

System

• Node.js version: v14.6.0
• NPM version: 6.14.7
• Strapi version: 3.1.3
• Database: postgres
• Operating system: linux