diff --git a/src/wp-admin/includes/post.php b/src/wp-admin/includes/post.php
index 7a1e2a81b4..0e19876e51 100644
--- a/src/wp-admin/includes/post.php
+++ b/src/wp-admin/includes/post.php
@@ -610,9 +610,11 @@ function bulk_edit_posts( $post_data = null ) {
 
 		if ( isset( $shared_post_data['post_format'] ) ) {
 			set_post_format( $post_ID, $shared_post_data['post_format'] );
-			unset( $post_data['tax_input']['post_format'] );
 		}
 
+		// Prevent wp_insert_post() from overwriting post format with the old data.
+		unset( $post_data['tax_input']['post_format'] );
+
 		$updated[] = wp_update_post( $post_data );
 
 		if ( isset( $post_data['sticky'] ) && current_user_can( $ptype->cap->edit_others_posts ) ) {
diff --git a/tests/phpunit/tests/admin/includesPost.php b/tests/phpunit/tests/admin/includesPost.php
index ee3edb8aa0..76802b4fa1 100644
--- a/tests/phpunit/tests/admin/includesPost.php
+++ b/tests/phpunit/tests/admin/includesPost.php
@@ -254,6 +254,41 @@ class Tests_Admin_Includes_Post extends WP_UnitTestCase {
 		$this->assertEquals( 'closed', $post->ping_status );
 	}
 
+	/**
+	 * The bulk_edit_posts() function should preserve the post format
+	 * when it's unchanged.
+	 *
+	 * @ticket 44914
+	 */
+	public function test_bulk_edit_posts_should_preserve_post_format_when_unchanged() {
+		wp_set_current_user( self::$admin_id );
+
+		$post_ids = self::factory()->post->create_many( 3 );
+
+		set_post_format( $post_ids[0], 'image' );
+		set_post_format( $post_ids[1], 'aside' );
+
+		$request = array(
+			'post_format'    => -1, // Don't change the post format.
+			'_status'        => -1,
+			'post'           => $post_ids,
+		);
+
+		bulk_edit_posts( $request );
+
+		$terms1 = get_the_terms( $post_ids[0], 'post_format' );
+		$terms2 = get_the_terms( $post_ids[1], 'post_format' );
+		$terms3 = get_the_terms( $post_ids[2], 'post_format' );
+
+		$this->assertSame( 'post-format-image', $terms1[0]->slug );
+		$this->assertSame( 'post-format-aside', $terms2[0]->slug );
+		$this->assertFalse( $terms3 );
+
+		$this->assertSame( 'image', get_post_format( $post_ids[0] ) );
+		$this->assertSame( 'aside', get_post_format( $post_ids[1] ) );
+		$this->assertFalse( get_post_format( $post_ids[2] ) );
+	}
+
 	/**
 	 * @ticket 41396
 	 */