Heirs who are not in the civil records. Children born in America, holding American passports, who were never entered in the register back home. Their share cannot simply be recognized — they have to be formally established first. This is the most common complication we see, and it is entirely solvable, but it does not resolve itself.
One heir who will not sign. A sale of jointly held inherited property normally needs the heirs to agree, so one refusal stops everything. Where agreement is impossible there are legal routes to divide the estate so each share can be dealt with independently. That is litigation, not paperwork, and it needs someone on the ground.
Land that was never properly registered. Ottoman, British Mandate, Jordanian and later rules all left their marks on the registry. Parcels are held under old arrangements, informal divisions and handshake agreements that were never recorded. Establishing what is actually owned comes before establishing who inherits it.
Time. Every year that passes adds a generation of heirs, multiplies the signatures required, and lets someone else's use of the land harden into a claim.