At first, I thought it is intentional for Rime without balm lily. After reading JungleFrozen.yaml I believe this is not the case. There should be balm lily seeds buried somewhere in Rime jungle biome. A bit looking around, it turned out SwampLilySeed absent from worldgen/mobs.yaml. Adding SwampLilySeed to mobs.yaml resulting balm lily seed appear in new generated rime world as requested by JungleFrozen.yaml.
Steps to Reproduce
Generate new rime world
This issue has not been confirmed by a developer yet.