boss structures like blossom are not spawning and the lich only spawns in ice spikes which is about 50k blocks away from spawn
TLDR: bosses spawn really far and are annoying to find

Can you replicate this situation consistently? I installed both of them and I am not seeing the issue occurring

yes, yes I did I opened 5 new worlds with /locate command and found the lich like 20k - 50k blocks away (blossom never spawned)

This is the mod list i am using is there something different you used
[✔️] BOMD-1.3.7-1.18.2
[✔️] cardinal-components-api-4.1.4
[✔️] cloth-config-6.2.57-fabric
[✔️] fabric-api-0.47.6+1.18.2
[✔️] fabric-language-kotlin-1.7.2+kotlin.1.6.20
[✔️] geckolib-fabric-1.18-3.0.35
[✔️] Oh_The_Biomes_You'll_Go-fabric-1.18.2-1.4-RC-1
[✔️] TerraBlender-fabric-1.18.2-1.1.0.91
[✔️] Terralith_v2.2.1a