In that position it could possibly be a flower bud. When you stem prop you're starting with tissue that only existed in the first place to help support and produce flowers. You're trying to convince it otherwise. It may be confused for a while. It could also be the start of a shoot that just hasn't greened up yet. Either way it takes time to re-establish a normal vegetative growth pattern. I'd say it looks healthy and should eventually make up its mind to go along with you. I've seen some pretty bizarre things pop up in tissue culture - a structure or growth pattern that us totally unexpected. You've put this plant into a totally foreign environment. You can't blame it for trying to assert its independence. Wouldn't you?