immersive-portals-2.3.3-mc1.19.2-forge.jar
geckolib-forge-1.19-3.1.40.jar
konkrete_forge_1.6.0_MC_1.19-1.19.2.jar
biomesinjars_forge_1.1.2_MC_1.19-1.19.2.jar

With these mods installed, biome changes do not update immediately. Instead of an immediate biome update on either using an empty biome jar or a filled biome jar, the biome stays the same unless the chunk is reloaded (by leaving render distance radius).

Its gecko lib.