Lava spawns in the deep dark and ancient cities

The deep dark is supposed to be a dark biome and lava ruins the atmosphere of the deep dark and ancient cities. There shouldn’t be lava in the deep dark or ancient cities.

How to reproduce

Load up a world and locate a deep dark biome or an ancient city, you will find a dark atmosphere until you see lava in the darkest biome in Minecraft

Expected results

The deep dark should retain a dark atmosphere without lava

Observed results

You will find lava in the deep dark and ancient cities that ruin the dark atmosphere of the deep dark

These pictures have lava in the deep dark, even obstructing an ancient city that is not supposed to be SUBMERGED by lava