fortresses do not seem to spawn above lava lakes like they used to in 1.15.2 and below and also the 1.16 snapshots and 1.16 pre 1 and 2 but now the do not seem to spawn there anymore i do not know if this is intended or if it is a bug
seed= -2143500864 at position 523 ~ -283
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What exactly is your issue?
If you mean that there used to be a nether fortress there, but it moved around to somewhere else, in that case this is to be expected since the rarity of fortresses changed in a recent pre-release, changing where they are able to spawn.
but they are not generating above lava lakes like they used to
and they also seem to be underground 9/10 times
Nether Fortress spawning code has slightly changed, have you observed this with just this one fortress on this one see or on multiple occasions?
yes i have seen this in other places too even when a fortress has more then enough room to spawn it wont
As mentioned in the changelog, the fortress spawning code has been altered, so fortresses spawn in slightly different locations now - in the seed you provided, I was able to find several over lava lakes as well, so you are probably just having bad luck.
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if this is not a bug then i am sorry for that