Axolotls arent pathfinding to the water correctly, when there's lava in front of them they will just go in it and won't avoid it. If they're surrounded by lava (in a ring formation) they won't go in the lava even if there is water five blocks away. But if you place a block near a block that they are on, their pathfinding will break and they will go into the lava again.
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We're tracking this issue in MC-208601, so this ticket is being resolved and linked as a duplicate.
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Duplicate of MC-208601