Spawn pont is messed up

so i started a new survival world on seed 29300 (my fav seed) with the cave update ex enabled. i spawned in a birch forest instead of the beach coast spawn. at first I thought that the new world generation completely remade my seed. then I see the pillager outpost from my creative world (also with seed 29300) and I remake the same world in creative. turns out the spawn in the seed got moved like 500 blocks away from the place it was supost to be. whats going on mojang? i this is messed up