The bug

Eggs laid by "temperate" chickens are simply named "Egg", unlike the other two types of egg from this snapshot, which are named "Blue Egg" and "Brown Egg".

How to fix

Give the old egg type a proper name, e.g. "White Egg".

Further notes

May also be worth retexturing said egg so it appears white rather than yellow.

All other egg types in the game are named after the animal they come from (Dragon Egg, Turtle Egg, Sniffer Egg); why shouldn't these follow suit? Rename to "White Chicken Egg", "Blue Chicken Egg", "Brown Chicken Egg"