Dragon eggs and Wither eggs are in incorrect category

They are not supposed to be available in the Creative inventory and will be removed at a later stage. Please see the changelog:
https://feedback.minecraft.net/hc/en-us/articles/10828527738893-Minecraft-Beta-Preview-1-19-60-20

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@bartłomiej Słodkowski I thought this was a bug report because all spawn eggs are in nature...