Do diphthongs adopt all the features of their components? For example, ɔɪ consists of ɔ (sonorant, continuant, approximant, voice, round, back, syllabic) and ɪ (sonorant, continuant, approximant, voice, high, front, syllabic). So is ɔɪ all of those (sonorant, continuant, approximant, voice, round, high, back, front, syllabic)?
And if this is the case, how are the features of diphthongs determined from their component phonemes?