Specifically for loading biomes, citadel seems to use BIOME_DICT or BIOME_CATEGORY which seem to be invalid in 1.19.+ and should be changed to BIOME_TAG.

@CrossKnight07 this is a big log spam issues over thousands of lines mentioning
[09:19:36] [Server thread/WARN] [citadel/]: biome config: BIOME_DICT and BIOME_CATEGORY are no longer valid in 1.19+. Please use BIOME_TAG instead.
09:19:36.008
game
[09:19:36] [Server thread/WARN] [citadel/]: biome config: BIOME_DICT and BIOME_CATEGORY are no longer valid in 1.19+. Please use BIOME_TAG instead.
09:19:36.008
game
[09:19:36] [Server thread/WARN] [citadel/]: biome config: BIOME_DICT and BIOME_CATEGORY are no longer valid in 1.19+. Please use BIOME_TAG instead.
09:19:36.008
game
[09:19:36] [Server thread/WARN] [citadel/]: biome config: BIOME_DICT and BIOME_CATEGORY are no longer valid in 1.19+. Please use BIOME_TAG instead.
09:19:36.008
game
[09:19:36] [Server thread/WARN] [citadel/]: biome config: BIOME_DICT and BIOME_CATEGORY are no longer valid in 1.19+. Please use BIOME_TAG instead.
09:19:36.009
game
[09:19:36] [Server thread/WARN] [citadel/]: biome config: BIOME_DICT and BIOME_CATEGORY are no longer valid in 1.19+. Please use BIOME_TAG instead.
09:19:36.009
game
[09:19:36] [Server thread/WARN] [citadel/]: biome config: BIOME_DICT and BIOME_CATEGORY are no longer valid in 1.19+. Please use BIOME_TAG instead.
09:19:36.009
game
[09:19:36] [Server thread/WARN] [citadel/]: biome config: BIOME_DICT and BIOME_CATEGORY are no longer valid in 1.19+. Please use BIOME_TAG instead.
09:19:36.009
game
[09:19:36] [Server thread/WARN] [citadel/]: biome config: BIOME_DICT and BIOME_CATEGORY are no longer valid in 1.19+. Please use BIOME_TAG instead.
09:19:36.009
game
[09:19:36] [Server thread/WARN] [citadel/]: biome config: BIOME_DICT and BIOME_CATEGORY are no longer valid in 1.19+. Please use BIOME_TAG instead.
09:19:36.009
game
[09:19:36] [Server thread/WARN] [citadel/]: biome config: BIOME_DICT and BIOME_CATEGORY are no longer valid in 1.19+. Please use BIOME_TAG instead.
09:19:36.009
game
[09:19:36] [Server thread/WARN] [citadel/]: biome config: BIOME_DICT and BIOME_CATEGORY are no longer valid in 1.19+. Please use BIOME_TAG instead.
09:19:36.009
game
[09:19:36] [Server thread/WARN] [citadel/]: biome config: BIOME_DICT and BIOME_CATEGORY are no longer valid in 1.19+. Please use BIOME_TAG instead.
09:19:36.009
game
[09:19:36] [Server thread/WARN] [citadel/]: biome config: BIOME_DICT and BIOME_CATEGORY are no longer valid in 1.19+. Please use BIOME_TAG instead.
09:19:36.009
game
[09:19:36] [Server thread/WARN] [citadel/]: biome config: BIOME_DICT and BIOME_CATEGORY are no longer valid in 1.19+. Please use BIOME_TAG instead.
09:19:36.009
game
[09:19:36] [Server thread/WARN] [citadel/]: biome config: BIOME_DICT and BIOME_CATEGORY are no longer valid in 1.19+. Please use BIOME_TAG instead.
09:19:36.009
game
[09:19:36] [Server thread/WARN] [citadel/]: biome config: BIOME_DICT and BIOME_CATEGORY are no longer valid in 1.19+. Please use BIOME_TAG instead.
09:19:36.009
game
[09:19:36] [Server thread/WARN] [citadel/]: biome config: BIOME_DICT and BIOME_CATEGORY are no longer valid in 1.19+. Please use BIOME_TAG instead.
09:19:36.009
game
[09:19:36] [Server thread/WARN] [citadel/]: biome config: BIOME_DICT and BIOME_CATEGORY are no longer valid in 1.19+. Please use BIOME_TAG instead.

this needs a fix asap