bootscore is not gutenberg block compatible

But my recommendation is to use Gutenberg HTML block instead of plugins.

<div class="row">
    <div class="col-md-6">
        content
    </div>
    <div class="col-md-6">
        content
    </div>
</div>

If you want to use a block inside the columns do it like this:

<!-- open row and cols -->
<div class="row">
    <div class="col-md-6">

Gutenberg Block

    </div>
    <!-- close col -->
    <!-- open col -->
    <div class="col-md-6">

Gutenberg Block

    </div>
</div>
<!-- close row and col -->

This is the cleanest way and gives you the full control of everything.

Does that help?