Sabah entered the Malaysian federation. The Manila Accord expressly preserved the Philippine claim derived from Sulu and any rights under it.
Sources & further reading
01
Malaysia: United Nations member-state record
United Nations
02
Agreement relating to Malaysia
United Nations Treaty Collection
03
Manila Accord and accompanying statements
United Nations Treaty Series
Manila Accord, 31 July 1963, paragraph 12; accompanying Joint Statement, 5 August 1963, paragraph 8. UNTS vol. 550, no. 8029, pp. 348, 358.