I have read the interesting discussions e.g. in the comments herein the comments here and concluded that there should be a glide between the wovels, rather than a glottal stop, since the ie occurs within a single root, as opposed to, for example, the ii in sciigo. Yet I have heard a clear /st͡siʔ'ent͡so/ on Duolingo. I suppose there is some leeway, that's alright. But trying my best at what was meant to be the canonical pronunciation makes me feel better than "it's OK if you keep saying either way". What would the books say about this word?