Floating lava generates in treasure bastions

The bug

Treasure bastions are missing three lava blocks. The natural terrain at these three blocks isn't replaced during the generation of the bastion, so they can generate as air, netherrack, soul sand, etc. If they generate as air, the lava above will be floating.

How to reproduce

Seed: 265622

/execute in the_nether run tp @s 2050 57 -151 160 25