Setting Render Options to PHP for Block

Hi, I'm saving a block with the Meta Box Builder and am setting the Render Options to use a PHP function. I can set the render_callback successfully. It does use the callback as specified;

However, two minor issues:

1. When I enter a callback that uses a namespace, like "\TimberMetaboxBlocks\timber_blocks_callback"
   the generated code displays it with TWO backslashes: "\TimberMetaboxBlocks\timber_blocks_callback"
2. When going back to the settings, the render options automatically open on the "Code" settings panel. (PHP callback is still used correctly)