Inexplicable subworld progress wipe

[heavy sage]

Bug Description: Whenever I load into a subworld, all of my Calamity progress in my world is inexplicably wiped. It is only Calamity boss kills, and not ones from vanilla or any other mods. I'm not sure if this is even a Calamity bug; I tried reporting this to the Stars Above discord before, but didn't get a conclusive answer.
How to cause it: Go into a subworld (only tried a Stars Above subworld, and not the ones from Infernum or WOTG). The bug becomes apparent upon returning, via checking Boss Checklist.
Multiplayer: no

Windows / Mac / Linux: Which one are you using
Windows 10

Does your computer have a dedicated graphics card: yes
How many GB of RAM do you have: A lot, but I'm having trouble finding the exact number

[fickle ore]

probably boss checklist

[heavy sage]

I feel like I should've mentioned that before. Me using that mod is literally how I was able to "check" that boss progress is wiped. And I don't know how that's supposed to CAUSE the bug to begin with.

[prisma plover]

bug checklist worldsynching probably

wait no its subworlds

probaby a subworldlib issue

I recall Infernum and Wotg having something similar

[polar cedar]

I’m here to confirm infernum has a similar issue, but it didn’t wipe all calamity bosses it wiped a random amount of bosses.

[prisma plover]

ofc since it only has few bosses (literally just Argus) not 20+

[peak nest]

boss checklist has been known to unmark bosses in the past; boss checklist lite should prevent that from happening (if this is even a boss checklist bug)

I use subworlds in my mod regularly and have never once had a boss flag wiped that I've noticed

(I also don't use boss checklist, if it is caused by that mod)

[prisma plover]

boss checklist is known to sometimes fuck worldsyncing (which can wipe modded flags and sometimes even stuff like pet names)