ACF-query-posts-by-category.php

<?php 
$terms = get_field( 'blog_category_tax' );
foreach ( $terms as $term ):?>
	<div class="termWrapper">
		<h1><?php echo get_cat_name( $term );?></h1>
		<div class="featured_posts">
			<?php 
				$args = array(
				  'numberposts' 	=> 3
					'category'      => $term,
				);
				 
				$latest_posts = get_posts( $args );

				foreach ( $latest_posts as $post ) {
					echo $post->title;
					echo $post['title'];
				}
			 ?>
			
		</div>
	</div>
<?php endforeach; ?>