I already read this
Why isn't a nasalised vowel used for "divin" here?
answer, but I felt like I needed a more complete answer.
I know that some nasal vowel at the end of words are denasalized during liaison (although sources seem to disagree on the exceptions), but I haven't been able to find out what the resulting vowel is. What are the rules?
For example, are the examples of words ending in "-un" or "-um" /œ̃/ that denasalize during liaison, and if so, would the resulting vowel be /y/ or /œ/?