Versions
Minecraft Version: 1.16.5
Minecraft Forge Version: 36.2.35
Mod Version: 1.1.1

Describe the bug
Big birch doors are too transparent.

To Reproduce
Place two big birch doors in order to make a double big birch door.

Expected behaviour
I expect more "glass pixels" to see that the door is closed.

Screenshots
Original from your mod : https://i.ibb.co/7VYVY8R/screen.png
A try to fix the problem : https://i.ibb.co/vXFLky6/screen2.png

Edit:

I temporary fixed the bug with a ressource pack : click here to download
I replaced these files with a borderless glass texture :

• assets\manyideas_doors\textures\block\big_doors\wooden\birch\big_door_birch_mid_bottom_right.png
• assets\manyideas_doors\textures\block\big_doors\wooden\birch\big_door_birch_mid_top_right.png

Hello SigmaFlame,

despite, what you think, the texture of the Big Birch Door is not a bug, but a well planned design. I tested about five different glass patterns, and none of them appealed to me as the creator. I hope you will understand my decision, that I will not change the texture of this door. But you found the right solution for your problem: A individual Resource Pack.

Muse

My texture doesn't appeal to you? Maybe the mirror effect?

You can build a resource pack to change the textures, models and the blockstates json of the Big Birch Door.
https://minecraft.fandom.com/wiki/Resource_Pack
https://minecraft.fandom.com/wiki/Tutorials/Creating_a_resource_pack