I have a question about the Ben Ish Chai’s answer. I find it hard to believe that there was no need for a new kiddushin after Mattan Torah when there was probably no kiddushin in the first place (since it was before Mattan Torah and there was no mitzvah of kiddushin).
Alternatively, you can consider the case of those people to the case of someone whose heart stops but is then “brought back” by CPR — they were dead by a clinical standard, but “true” death is only when it’s permanent*.
It seems they are still Halachicly married, but she is allowed to marry someone else.
Does that make her children from the second marriage mamzeirim after Techias HaMeisim since her original marriage is still valid?
The Wolf
* Not counting the ultimate Techias HaMeisim, of course.