This plugin works great and is exactly what I was looking for. However, adding a widget just outputs the block's content without running it through wpautop():
# text-blocks.php, line 151 <div class="text-block"><?php echo $block->post_content; ?></div>
This means all of the text just looks jumbled together when used as a widget. Was there a reason for not adding wpautop() in the output?