Buttons placed on Blast Furnaces have a slight texture bleeding/flashing issue. I'm sure this issue is present on other objects because of the 3D modeling approach

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Thanks for reporting this! I've never really checked if this occurs on any blocks besides obvious redstone-related blocks.
I'll see if i can re-design the furnace slightly or something.

It's been a while but i finally fixed it :)

it'll be in the next update