CBBE 3BAv2 / UBE body etc., – small annoying Neck gap line

[Sawapine]

Hello.

After installing a 3BA body mod and running it through BodySlide, I encountered an issue where small gaps appear around my character's neck.

The neck gaps appear to show up on other bodies as well, such as the regular CBBE and UBE body.

This happens regardless of the character's weight, the clothing they wear, the body preset i build in BodySlide etc.
-- I disabled all possible mods related to makeup, body textures, skeletons etc., but that didn’t help.
-- I also tried ENB and Community Shaders to solve it in post-processing — none of them resolved the issue.
-- I used both the default head mesh and the high poly one – the gap is visible in both cases.

-- Sculpting in RaceMenu didn't help.

If anyone has faced a similar problem, please share your solution.

Here is my Load Order:

Spoiler

# This file was automatically generated by Mod Organizer.
Skyrim.esm
Update.esm
Dawnguard.esm
HearthFires.esm
Dragonborn.esm
ccBGSSSE001-Fish.esm
ccQDRSSE001-SurvivalMode.esl
ccBGSSSE037-Curios.esl
ccBGSSSE025-AdvDSGS.esm
_ResourcePack.esl
unofficial skyrim special edition patch.esp
UOSC.esl
DynamicCollisionAdjustment.esl
SmoothCam.esl
TrueHUD.esl
RaceCompatibility.esm
Expressive Facegen Morphs.esl
ECE Sliders for Racemenu.esl
Schlongs of Skyrim - Core.esm
TheNewGentleman.esp
High Poly Head.esm
SexLab.esm
Devious Devices - Assets.esm
SexLabAroused.esm
Devious Devices - Integration.esm
Devious Devices - Expansion.esm
Devious Devices - Contraptions.esm
ZaZAnimationPack.esm
Fertility Mode.esm
CreatureFramework.esm
iWant Widgets.esl
OCF.esp
Keytrace.esp
Dynamic Activation Key.esp
fixLOD.esp
UIExtensions.esp
McmRecorder.esp
AddItemMenuSE.esp
Soul Resurrection - Injury and Alternative Death System.esp
SkyUI_SE.esp
MCMHelper.esp
SkyHUD.esp
TrueDirectionalMovement.esp
BetterThirdPersonSelection.esp
I4IconAddon.esp
BOOBIES_ImmersiveIcons.esp
AIT.esp
UntarnishedUI_Subtitle.esp
RaceMenu.esp
RaceMenuPlugin.esp
RaceCompatibilityUSKPOverride.esp
RaceMenuHH.esp
HeelsFix.esp
FNIS.esp
HellbladeTimedBlock.esp
Precision.esp
Disable Turn Animation.esp
Apocalypse - Magic of Skyrim.esp
AlternatePerspective.esp
iNeed.esp
iNeed - Extended.esp
Animated Interactions.esp
Schlongs of Skyrim.esp
SOS - Smurf Average Addon.esp
SOSRaceMenu.esp
XPMSE.esp
CBBE.esp
RaceMenuMorphsCBBE.esp
3BBB.esp
SOSPhysicsManager.esp
RaceMenuMorphsHIMBO.esp
HIMBO.esp
Racial Body Morphs.esp
OBody.esp
Sheps_Tattoo_Collection.esp
ZhizhenTattoo.esp
zhizheneyes.esp
ZhizhenBrows.esp
ZhizhenMakeup.esp
(SDZ21) Beauty Marks.esp
DiabetoxEyes.esp
Even More Brows HPH.esp
Even More Eyes.esp
EvenMoreMakeup.esp
FMS_FemaleMakeupSuite.esp
Improved Eyes Skyrim.esp
Kala_Eyes.esp
Koralina's Eyebrows.esp
koralinas_freckles_moles.esp
Koralina's Makeup Tweaks.esp
Lamenthia's Marks of Beauty.esp
MikanEyes All in one SE.esp
Tullius Eyes.esp
VividEyes_Fissure.esp
[ELLE] Eyes Of Ellxe.esp
Koralina's COtR Makeup Female.esp
Koralina's COTR Details.esp
HirayaEyes.esp
(SDZ21) Lovely Makeup.esp
(SDZ21) Lovely Makeup 2.esp
SFO_SkinFeatureOverlays.esp
Beards for High Poly Head.esp
SMIM-SE-Merged-All.esp
Lit Road Signs.esp
Skyland Watercolor - Slow Green-Vanilla.esp
Nature of the Wild Lands.esp
Groundcover.esp
EnhancedLightsandFX.esp
ELFX - Exteriors.esp
evgmodularSMPhair.esp
chooeymodularSMPhairedit.esp
KSHairdosSMP.esp
Vanilla hair remake NPCs.esp
Random Faces of Skyrim - Bandits.esp
Bijin NPCs.esp
Bijin Warmaidens.esp
Bijin Wives.esp
New Hagravens.esp
Vee's Serana Valerica.esp
KuroneRimLydiaReplacer.esp
KuroneFollowers.esp
SexLab Inflation Framework.esp
Devious Devices SE patch.esp
OAroused.esp
OSLAroused.esp
SexLabDefeat.esp
SexLabDefeat_LRG_Patch.esp
Cumshot.esp
CumshotSL.esp
SlaveTats.esp
SexLab Eager NPCs.esp
YouDontNeedABreak.esp
titkit.esp
Fertility Mode 3 Fixes and Updates.esp
FM+ - Immersive Effects.esp
PregnancyNormalmapSwapper.esp
DynamicArmorMenu.esp
Common Clothing Expanded.esp
CBBE 3BA Vanilla Outfits.esp
CBBE 3BA Vanilla Outfits - HIMBO.esp
DH SIB.esp
MoreNastyCritters.esp
BakaFactoryABC.esp
MNC_ABC_Patch.esp
AnubAnimObj.esp
SLAL_AnimationByBakaFactory.esp
MilkModNEW.esp
MilkModNEW ZaZ.esp
MilkModNEW HF.esp
MilkMod_MilkPumpsFancy.esp
MilkMod_BodyMorph_MCM.esp
Milk Addict.esp
BreastRopeBEnableWeightSlider.esp
bac.esp
CowLifeServices.esp
CustomComments.esp
BimboSkin.esp
yps-ImmersivePiercing.esp
Shas' Equipable Handnails_VersionYps.esp
WetFunction.esp
iWant Status Bars.esp
SLWidgets.esp
Azurite Weathers III.esp
Azurite III - HDR.esp
StandardLightingTemplatesUSSEP.esp
FSMPM - The FSMP MCM.esp
ParallaxGen.esp
PG_1.esp