Frost Moon's boss Everscream won't unlock

[Bakasamaw]

Mine tModLoader Mod List(Newest to Oldest)

1. Catalyst Mod
2. ConsolariaCN
3. Consolaria
4. Rainbow Master: Color Relics
5. Calamity: Wraith of the Gods
6. Calamity: Hunt of the Old God
7. Subworld Library
8. Luminance
9. tML Language Pack Fix
10. Auto Reforge
11. ArmamentDisplay
12. Fargo系列的汉化合集（无突变与魂石）
13. Calamity - Fargo's Souls DLC
14. Colored Fargo Relics
15. Fargo's Music Mod
16. Chinese Patch for Fargo's Mutant Mod & Fargo's Souls Mod
17. Fargo's Mutant Mod
18. Fargo's Souls Mod
19. AlchemistNPC Lite
20. Calamity's Vanities
21. Disable Meteor Dropping
22. Angler Shop
23. Wing Slot Extra
24. Magic Builder
25. Calamity Chinese Translation Patch
26. Autofish
27. Better Boss Health Bar for 1.4.4+
28. Calamity Mod
29. Calamity Mod Music
30. Colored Calamity Relics
31. Census - Town NPC Checklist
32. HP Awareness
33. Smart Cursor
34. Magic Store
35. absoluteAquarian Utilities(SerousCommonLib)
36. Gravitation Don't Flip the Screen
37. Basic Automated(Vein) Mining
38. Quality of Terraria
39. Boss Cursor
40. Boss Checklist
41. Recipe Browser

Issue Detail

In the Frost Moon event, I've successfully defeated both Boss 'Santa-NK1' and Boss 'Ice Queen,' and their progress is properly unlocked in the Boss Log. However, the event's Boss 'Everscream' still remains locked despite having a kill count of 12 in the log—it continues to display as 'undefeated.

Requirement

I'd like to know whether this is a bug, or if the boss has some special unlock conditions that need to be met?

[JavidPack]

It's possible a mod is adding a condition, or an error is another mod is preventing it from being checked off. With that many mods you'll need to do some testing, probably starting with verifying that it checks off if boss checklist is the only mod enabled, then going from there.