I just created another post object field in the same form and that works fine: I can do a add_post_meta( $post_id, 'temporary_second_post_object_field', $_REQUEST['my_post_id'] ); and the field assumes that value with no problems!
I suppose deleting the original field and recreating it might work, but I can’t really afford to do that, I’ve got hundreds of values in it that I’d have to painstakingly restore somehow…. also I suppose this might happen again any time.
Could this be some obscure bug, then?
