When making a world with a custom height, all caves would appear to be filled with lava if the world is deeper than level -64. For further explanation, when I make a world that is -256 deep, they appear to be flooded with lava from -64 all the way to -251. In an uncustomized world, they all appear to be flooded with lava at level -54 instead of -57.
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Btw the default lava level (on 1.18 snapshot worlds that don't have their height changed) is -54 not -64. Can you confirm which of those two you're experiencing?
The issue is still persistent in 1.21.3, however it has the caveat now that the cave lava fill is tied to sea level. Lowering the sea level causes the lava level to drop. The problem now seems to be that sea level and lava level do not function independently when specified to do so.
This issue is very important for custom worldgen now that MC-226687 has been resolved. Floating Islands-style custom worldgen packs usually set sea-level to -64 to remove the lava at the bottom of the world. But now, doing this results in a cascade of unintended side-effects, like preventing aquatic mobs from spawning above the bottom of the world.
Can you still reproduce this in 21w38a or later?