The Bug
The lava lakes can be generated with exposed lava in the caves.
Seed to test and the coords:
-718647500
Coords: 633 -55 165
This bug was fixed on Java a while ago (MC-216736), so this can be considered a parity issue.
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I've noticed this quite a bit, especially in a cave that would have kept going down, had there not been a bedrock floor at y=-64. Despite there being obvious resource packs, I have neither added generation-affecting addons, nor turned on Creation of Custom Biomes.
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It is in the change log they are part of the new cave generation
Fixed in 1.17.0.54 beta
Looks like it still an issue in the latest beta, this was found just underneath lava aquifers...
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When the cave air cuts through the lava lakes, it leaves exposed lava source blocks that only start flowing when they receive a block update.
The caves are eating the lava lakes! /s