It will definately not show in custom_1 because you probably must have defined it for custom_2.However, you can define a custom submenu with link same as that of the taxonomy in which the parent link is that of custom_2.
Following is what i mean.
add_submenu_page( 'edit.php?post_type=custom_1', 'Page Title', 'Menu Title', 'add_users','edit-tags.php?taxonomy=custom_taxonomy', '' );
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