After a certain while loading the world, the server will crash with the following crash report:
crash-2023-08-18_13.38.01-server.txt
crash-2023-08-18_13.49.40-server.txt
crash-2023-08-18_13.11.30-server.txt

Stacktrace:
at solipingen.sassot.village.ModVillagerProfessions$TypeAwareSellForOneEmeraldFactory.lambda$new$1(ModVillagerProfessions.java:211)
at java.base/java.util.Optional.ifPresent(Optional.java:178)
at solipingen.sassot.village.ModVillagerProfessions$TypeAwareSellForOneEmeraldFactory.(ModVillagerProfessions.java:210)
at solipingen.sassot.village.ModVillagerProfessions.replaceFishermanProfessionToLeveledTrade(ModVillagerProfessions.java:89)
at net.minecraft.class_1646.localvar$dfl001$sassot$modifiedFilledRecipes(class_1646.java:4974)
at net.minecraft.class_1646.method_7237(class_1646.java:886)
at net.minecraft.class_3988.method_8264(class_3988.java:115)
at fabric.net.mca.server.SpawnQueue.tick(SpawnQueue.java:50)
at fabric.net.mca.server.world.data.VillageManager.tick(VillageManager.java:173)
at fabric.net.mca.fabric.MCAFabric.lambda$onInitialize$0(MCAFabric.java:50)
at net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents.lambda$static$6(ServerTickEvents.java:63)
at net.minecraft.class_3218.handler$bje000$fabric-lifecycle-events-v1$endWorldTick(class_3218.java:9240)
at net.minecraft.class_3218.method_18765(class_3218.java:396)

Three mods I seem to find in the crash report: MCA, Let's Do Beach Party, and Sassot. No crashes have happened until Sassot was installed.

EDIT: It seems to have incompatibility with mods that modify villager behavior

Okay, I give up, it seems it has incompatibilities with any mod that modifies villager behavior, removed MCA and Let's Do Beach Party and still same error appears but with a different villager type id from another mod

hey, sorry for this bump, but is there any update regarding this?

Thank you for writing in, and apologies for the late response.
The next update will attempt to address this alongside other fixes/changes. Please wait a little as this may take some (hopefully not much) time.

Thank you, soliplngen. Additionally, this crash report from Let's Do: Meadow might help you too. It's a similar error.

I find that these crashes often occur when I am traveling over a beach (might want to test out Let's Do Beach Party's Beaches too) near the ocean.

As of now, with MCA installed, I seem to not encounter any issues, maybe it's an incompatibility from the Let's Do series (specifically their villagers)? I suspected MCA since it has been tagged in the crash report but Let's Do Meadow was still there.

I have MCA too it seems to crash the same as yours

Apologies to all for the significant delay.
Both versions of v1.1.3.a-1.20.1 should have resolved this issue. Please let me know if the Issue persists, I will leave this Issue open for a few days.