Toggle vue-multiselect close/open on button click

When I click on the button, multiselect opens. But when I click on the button a second time, the true / false values ​​flash and as a result, isOpen remains true. What am I doing wrong?

template:

<div id="app">
  <button @click="toggle">open and close later
  </button>
    <pre>{{ isOpen }}</pre>
  <multiselect 
    ref="multiselect"
    v-model="value" 
    :options="options"
    :multiple="true"
    track-by="library"
    :custom-label="customLabel"
    @close="isOpen = false"
    @open="isOpen = true"
    >
  </multiselect>
</div>

js:

new Vue({
    components: {
    Multiselect: window.VueMultiselect.default
    },
    data: {
    isOpen: false,
    value: { language: 'JavaScript', library: 'Vue-Multiselect' },
    options: [
        {   language: 'JavaScript', library: 'Vue.js' },
      { language: 'JavaScript', library: 'Vue-Multiselect' },
      { language: 'JavaScript', library: 'Vuelidate' }
    ]
    },
  methods: {
    toggle () {
        if (this.isOpen) {
        this.$refs.multiselect.$el.blur();
        this.isOpen = false;
      }
      else {
        this.$refs.multiselect.$el.focus();
        this.isOpen = true;
      }

    }
  }
}).$mount('#app')

https://jsfiddle.net/46s5aknt/

As I dug the source code of this component, unfortunately, I realized there is not any "legit" way to make works your requirement. @blur callback will be called no matter what. There is no way to regulate this behavior.

Workaround: some aspect of locking with a cooldown time...

new Vue({
  components: {
    Multiselect: window.VueMultiselect.default
  },
  data: {
  blocked: false,
  value: { language: 'JavaScript', library: 'Vue-Multiselect' },
  options: [
    { language: 'JavaScript', library: 'Vue.js' },
    { language: 'JavaScript', library: 'Vue-Multiselect' },
    { language: 'JavaScript', library: 'Vuelidate' }
  ]
},
  methods: {
    toggle () {
      if (!this.blocked) {
        this.$refs.multiselect.toggle();
      }
    },
    block () {
      this.blocked = true;
      setTimeout(() => {
        this.blocked = false;
      }, 200);
    }
  }
}).$mount('#app')