Seed: [-159720797642270077]
Bottom left obsidian block coordinates: 55 63 -8
Bottom right obsidian block coordinates: 58 63 -8
Form a portal by adding the remaining obsidian blocks. Light the portal and enter Nether.
The portal will spawn above lava with no obsidian platform.
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Hmm, it might be a good idea to make the portal appear only on blocks that are not affected by gravity. Like not allow the portal to appear on gravel, make it only appear on netherrack and other neither blocks which are not affected by gravity.
I am no longer able to reproduce this in 20w51a using the provided seed and coordinates as the nether generation has changed since the date that this issue was reported. This doesn't mean the issue doesn't exist however, so its best to leave this ticket open, just in case someone encounters this in the future.
Can confirm... however the portal does not generate directly above lava, instead it generates directly on top of gravel that is floating above the lava. The portal generation then immediately updates the gravel, so that it falls into the lava lake.