This feature was exclusively part of a joke version and is not currently planned for addition to regular Minecraft. It is documented here on the wiki due to being officially-released content by Mojang Studios, even if not present in a final version.
Redstone bugs can spawn if a redstone wire increases the strength. The chance that they spawn is 1%. The chance increases for every redstone bug in a 7x7x7 area by 5%. The Color value of the bug can reach from 33292288 to 66846720.
Behavior[]
Redstone bugs, effectively being reskinned silverfish, shared all of their behavior.
Data values[]
ID[]
Name
Savegame ID
Numeric ID
Translation key
Redstone Bug
Silverfish
60
entity.Silverfish.name
Entity data[]
Redstone bugs used the ID of silverfish, different from them only by a newly-added Color NBT, which could have any color applied to it via editing. The first byte defines the alpha value and the other three the rgb color.