@ pizza. Some languages are pretty consistent in that a certain syllable (for example the first, the second, etc) is always stressed. This is not true of English. We have no way of knowing how a new word in the language is stressed until we hear it used. Once a word has been used enough for dictionaries to record it, we can then check there..
You wrote, "Both /d/ and /s/ are alveolars. Therefore, your hearing /ɪ/, instead of a schwa, is reasonable". The use of 'therefore' suggests that it was the presence of the alveolars that caused /ɪ/ to be heard. I pointed out that this was not so; /ɪ/ can occur between bilabial and labio-dental (and other) consonants.