"...According to the law that you cited, it is an act of Apartheid to prevent someone from being able to return to their land of residence...
1. their land of residence is where they are now
2. any other large-scale land transfers occurred prior to the effective date of the Convention
That is not what the Convention says.
Israeli Marriage Laws are religious rather than racial or ethnic or citizen-focused in nature, and they closely mirror Islamic Marriage Laws of the region which are also still operative.
Anything happening within Palestinian jurisdiction is the responsibility of the Palestinians.
Israeli Law applies to Israeli citizens.
The Palestinians in the West Bank and Gaza are not Israeli citizens.
"...It is an act of Apartheid to limit where Palestinians can go and where they can live..."
Within the West Bank and Gaza, it is the Palestinians themselves who determine who may go where.
The Israelis have the right to decide who may travel on Israeli soil and who may not.
The Israelis have the right to decide who may reside on Israeli soil and who may not.
The United States reserves those same rights to themselves.
As does virtually every other country on the face of the planet.