Hello :)
With "BlockState Culling" turned on, glass becomes "see-though" on sides that are next to solid blocks.

Is this a bug or a feature?

With this mod in 1.19.4, this did not happen

can you send screenshot of it? for me glass looks normal

still cant reproduce

maybe i downloaded the wrong version of bdcraft?

Only difference is I use the 256x version :O
Now Im more confused, but thanks :)

This is with the setting "on"

This is with the setting "off"

I even tried to disable all other mods and just this one, same happens.

I tested some more, to see what happened if I removed my texture pack, and it does not happen with default texture.
It happens with this setting "on" and "PureBDCraft" texture pack at the same time.

Possible that you can test this combo too?

it seems to happen only with 256x version. i will look in to it once i finish poritng to 1.21.4, you can add glass to the dont cull list for now