Jordan and Egypt occupied the OPT from 1948 to 1967,
And it didn't belong to them.
the persons with the right of self determination with respect to these lands are the indigenous Palestinian people.
Why? They never had self-determination on that land before. Ever.
Israelis are Occupiers, they have no sovereignty rights with respect to the land.
Who last had sovereignty rights to that land?
The realization of self-determination is the creation of an independent state. Self determination predates sovereignty. Self-determination exists separate from statehood.
The Palestinians have always had, and still have, sovereign rights to the land. It has always been foreign intervention that has denied them that right.
It is clearly illegal under international law to deprive a people of their right to self-determination by using forcible actions including use of violence.