It seems that someone reverted this change. The middle layer is referred to as a "custard layer" in some online sources, but in others it's referred to as a "custard buttercream". Most accurately, it's a buttercream frosting made with custard powder, which adds vanilla flavouring and stiffness. None of the recipes I can find require making a custard or using eggs. I've edited it to say it's a "custard icing". I think there may be better wording for this, but calling it a custard layer alone is not accurate or descriptive.
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