Update src/Media_Command.php

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: swissspidy

src/Media_Command.php

@@ -1037,6 +1037,10 @@ private function process_prune( $id, $image_sizes, $remove_abandoned, $progress,
 		$sizes_to_prune   = array();
 
 		foreach ( $metadata['sizes'] as $size_name => $size_meta ) {
+			// The 'full' size is not an intermediate size and should never be pruned.
+			if ( 'full' === $size_name ) {
+				continue;
+			}
 			$is_registered = in_array( $size_name, $registered_sizes, true );
 
 			// Determine whether this size should be pruned.