I've seen a lot of floating land formations but this seems a little too odd. The seed is "-7302058265901491281"
x: 55
z: -5
This formation was naturally generated by the game in "extreme hills" biome. Half of the formation is in the "Stone beach" biome, this may be unrelated but It might be the cause of the bug.
If this is a purposeful feature then I apologize in advance.
Linked issues
is duplicated by 31
MC-65217
Extreme Hills biome generates floating blocks
Resolved
MC-135045
Funky Terrain Generation With Small Floating Pieces
Resolved
MC-195586
Generator bug in snapshot 20w29a
Resolved
MC-207658
Sometimes it spawns some weird blocks.
Resolved
MC-209240
Floating strip of dirt in taiga biome
Resolved
26 more links
Random terrain generator is random, I'd say, since I get it too.
Looks a bit like Africa. Weird, huh?