Leovec_CZ
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Yeah, this is a duplicate... Look at bug report MC-184740 . In the new 20w21a ALL structures got "renamed". Their names changed for example from "Monument" to "monument" but upgrading to newer version does not update the world files, so the structures won't work. This happens with every structure (Nether fortress, monument, witch huts and others.)
I generated two worlds, one in 20w20b and one in 20w21a. Both had same seed and were exactly the same. All structures worked as intended. I looken into the region files of both worlds and the only difference was the capitalization of structure names. When I openned the world made in 20w20b in 20w21a, no structure specific mobs were spawning. In region files, the old data remained unchanged, but it created another set of structures, but with names all lowercase and no data that specified, that at the location is a structure. (I hope you get what i mean, my English is not the best)
@Rikhil Tadiparthi, He's using NBT explorer.
I tested this in my MP survival world, works as intended. Smelts 100 items and it's not an infine fuel source.
@Hristo Netchev, could you please explain the second step about finding the origin? I was working on a huge project with the nether fortress, but it was all for nothing with this update. So I'd like to try to fix it for myself and I can't figure out what you mean in the second step. Thanks for now.