While exploring the nether, I found some lava defintiely did flow down, but came across one that didn't.
This is a 1.17 world, upgraded from 1.17.1, but I am pretty sure this is a 1.18 chunk. (newly generated)
This was upgraded to 21w44a from a fresh backup, so its only been upgraded from 1.17.1=> 21w44a
seed: 1823439624 (also in screenshot)
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Duplicates MC-223840

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It's definitely a source block, I just flew above it this is the top view:
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