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Mandarin speakers are seem to be fairly sloppy with their own phonetic alphabets - you're supposed to have spaces in bopomofo and apostrophes in pinyin to handle cases like these, but they often don't bother.

It becomes clearer with tones I guess, "Xi1 An1" vs "Xian1". But again, proper pinyin with tones seems to be a foreigner thing... I don't recall seeing tone marks or numbers on street signs.

But that's what you have the apostrophe for in Pinyin. Works fine.

But pinyin isn't Chinese so your point just doesn't exist.