B-Tab No longer works in IE 11 due to find() method

Describe the bug

In IE11 B-Tabs produces this error

Error in nextTick: “TypeError: Object doesn’t support property or method ‘find’” found in BTabs

Steps to reproduce the bug

My Code utilizing B-Tabs

<b-tabs class='mx-4'>
                <b-tab title="test 1"
                       key="1"
                       active
                       v-on:click="SetFocus(0)">
--- Components in different <b-row></b-row>
      </b-tab>
                <b-tab title="test 2"
                       key="2"
                       v-on:click="SetFocus(0)">
--- Components in different <b-row></b-row>
      </b-tab>
                <b-tab title="Activity"
                       key="3"
                       v-on:click="SetFocus(0)">
--- Components in different <b-row></b-row>
      </b-tab>
</b-tabs>

Expected behavior

This is a recent issue and my assumption is with a recent release? I updated from rc14 to rc19

Versions

Libraries: “axios”: “^0.18.0”, “bootstrap”: “^4.3.1”, “bootstrap-vue”: “^2.0.0-rc.19”, “vue”: “^2.6.8”, “vue-class-component”: “^7.0.1”, “vue-property-decorator”: “^7.3.0”, “vue-router”: “^3.0.1”, “vue-session”: “^1.0.0”, “vuex”: “^3.1.0”, “vuex-class”: “^0.3.1”, “vuex-module-decorators”: “^0.8.0”

Additional context

[tmorehouse]

If serving your app over the web, you can use https://polyfill.io, which only delivers polyfills needed by the browser (based on the browsers User-Agent string).

[tmorehouse]

Fixed the URL typo in my above comment…

Here is the polyfill.io URL we recommend (as there are quite a few other things we use that is not supported in some older browsers):

//polyfill.io/v3/polyfill.min.js?features=es2015%2CMutationObserver

Which also includes MutationObserver polyfill needed for some components.

Only the polyfills needed by the browser are downloaded.