They keep flashing with any shader or texture pack, even with vanilla Minecraft it's not good.

In order to be able to resolve this, I will need more information.
Listing the forge version, other mods you have loaded and the texture packs you tried would already help out a lot. Thanks!~

OK, so this is what I've got at the moment:

GAME VERSION
Minecraft 1.14.4

FML VERSION
Forge 28.1.0

OPTIFINE VERSION
HD U F4 pre9
Because the final stable version didn't allow me to launch the game for now

MODS
Advanced Skin Customization 2.0.2
Better Animals 5.2.1
Camera 1.4.8
Carry On 1.12.3
Crafting Station 2.0.2
Create 0.1.1
Enchantment Descriptions 1.3.3
Filters 1.0.0
Free Look 1.3.1
Go Prone 1.0.3
HWYLA 1.10.6-B67
JEI 6.0.0.11
MineMenu 1.8.2
Shoulder Surfing 1.20
Sit 1.1.3
Smooth Scrolling Everywhere 1.1
Trash Slot 10.4.7
Tree Choppin 1.2.0
WorldEdit 7.0.1
WorldHandler 2.6.4

SHADERPACKS
I use one of these
Sildurs Enhanced Default 1.09
Sildurs Vibrant Shaders 1.23 (any version)
SEUS 11.0
SEUS Renewed 1.0.0

RESOURCEPACKS
I use one of these
Faithful (any version)
VanillaBDcraft (any version)
It didn't work well without texture packs either

SCREENSHOT

Thank you! Do you have footage on what it looks like without any active resource packs?

Alright, sorry for the long delay. so I did some testing:

1. Fortunately without any shaders and resourcepacks it works just fine.

NO RESOURCEPACKS
2. When I turn on my SEUS Renewed shaders this happens: SCREENSHOT
3. When I turn on my Sildurs Vibrant shaders this happens: SCREENSHOT

NO SHADERPACKS
4. When I switch to Faithful resourcepack this happens: SCREENSHOT
5. When I switch to VanillaBDcraft resourcepack this happens: SCREENSHOT

It seems like that with shaders most of the moving blocks flash for no reason and with the resource packs the belt's texture changes constantly.

UPDATE
I figured out that changing shaders mid-game will cause cogwheels and other moving parts to flash, but if I close the game completely and reopen it there will be no flashing on other moving blocks except the belt.

Thank you, this will come in handy!

Anytime! I just wanted to let you know that your mod is unique and awesome :)

I just realized that it works fine with LB Photo Realism texture pack.

When I turn off shaders mid-game this happens:

Only assets from this mod create this issue, I have lots of assets from different mods and none of them creates a similar issue:

Good grief.. Shaders are cursed =S

Is it because of shaders or OptiFine?

It's both, they affect the special rendering. It is difficult to debug compatibility issues with optifine, but given its popularity not something I should ignore. I will try to reach out to some people with experience.

Thanks a lot!

This should be addressed in the new version that went live just now.
Thanks for the Issue and feel free to re-open if need be.