FOSS gamedev and creative worlds

i instaled Soartex fanver texture pack and i had a texure test drive map and i watched at coal and iron but they are only stone and i break them all and they droped coal and iron lump so it is a texture bug

Make sure the stone, stone-with-coal, and stone-with-iron textures all have a proper alpha channel (even if it isn't visible). Without these, the game will not overlay the coal/iron textures properly and all you'll see is plain stone.

and how i can do this ???