When placing furnaces with World:SetBlock they become invisible

[MGlolenstine]

Might be a block entities issue? Does this happen with e.g. chests, command blocks, signs, mob spawners?

By invisible, do you mean the hitbox is still there but the textures aren't rendered, or it just disappears allowing you to put another block there? If you can put another block in the furnace's place, does the furnace only reappear when you break the block, or does it reappear automatically?

The furnace isn't there at all, there is no hitbox, no texture, and you can place the block in the same place, but if you right-click on the block in the place of the Furnace(wool for example), it opens up a furnace gui and if you break the block after, the "furnace" dissapears. Furthermore, the furnace is detected by the World:ForEachFurnaceInChunk.

thanks for your help