My friends and I reset our nether in the 1.16 update to start building the wither skeleton farm, we did all the necessary steps and after 1 year, already in 1.17.1 we finished, but now the game no longer considers the location as a fortress, even the fortresses that existed in the region are no longer considered.
I'm going into depression

obs. during that year, we started hosting the server through Realms.
clip from when we were building - https://bit.ly/39iNdCM
seed: -6103425654111034201

thats google translated