Bonus chest generating in closest dry cave instead of at spawn point

In the 1.18 experimental version the bonus chest is generating in the nearest dry cave instead at the spawn point on the ground. I collected 3 examples for you.

Seed -2108094025

https://www.instagram.com/p/CSiWPQkDV2_/

Seed 10831662

https://www.instagram.com/p/CSiWUrdDm-g/

Seed 6813736

https://www.instagram.com/p/CSiWkVmjxnx/

 

Also, all caves open to the surface are flooded.