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Abraham was probably alive long before Egypt raided canaan at all (and this is as much of an assumption as saying that hagar was probably a canaanite).

Abraham was also probably alive when Egypt was in its middle kingdom phase. A time when Egypt did not have much war period, so most of its slaves came from debt slavery and as a judicial punishment.

Furthermore, the Bible probably would have said if hagar was a canaanite. Because it said so in every other case

And, barring all of that, it literally says that Ishmael is given a promise by God in genesis 21.