It seem like the seed is not taken into account in the generation because here is 3 worlds with the same seed with player almost at the same block
MC-187366
Recreating worlds does not give the same world
Resolved
Duplicate
0
Adrien 'Larandar' DUDOUIT-EXPOSITO
(Unassigned)
Unconfirmed
(Unassigned)
1.16 Pre-release 1
Retrieved
This explains MC-187358, thanks.